pngnq-1.0/0000777000175000017500000000000011217143475007507 500000000000000pngnq-1.0/README0000644000175000017500000000601211204771040010271 00000000000000PNGNQ - PNG NEUQUANT VERSION 0.5 USAGE: pngnq [-vfhV][-s sample factor][-e extension][-d dir][-n colours][-Q f|n][input files] options: -v Verbose mode. Prints status messages. -f Force ovewriting of files. -s Sample factor. The neuquant algorithm samples pixels stepping by this value. -n Number of colours the quantized image is to contain. Range: 2 to 256. Defaults to 256. -e Specifies the new filename extension. Defaults to -nq8.png. Will drop .png from original filenames. -d Relocates the quantized files into this directory. Otherwise output files stay in the same directory as the input files. input files: The png files to be processed. Defaults to standard input if not specified. -Q Dithering method: f = Floyd Steinberg, n = None (default) -V Print version number and library versions. -h Print this help. Quantizes a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG using the neuquant algorithm. The output file name is the input file name extended with "-nq8.png" or a specified extension. NOTES: Pngnq is a tool for quantizing PNG images in RGBA format. Pngnq is an adaptation by Stuart Coyle of Greg Roelf's pnqquant program using Anthony Dekker's neuquant algorithm. Pngnq exists because I needed a lot of png images in RGBA format to be quantized. After some searching, the only tool I could find that worked was pngquant. I tried pngquant but found that the median cut algorithm that it uses, with or without dithering, gave inferior looking results to the neuquant algorithm. You can see the difference demonstrated on the neuquant web page: http://members.ozemail.com.au/~dekker/NEUQUANT.HTML. The program was written to fulfill the specific needs of the small project I was working on, and as such does not have all the functionality one could want. I use Greg Roelf's png reading and writing code unchanged for the most part. The pngnq source code includes neuquant32, which is an extension of Anthony Dekker's neuquant, to make it handle 4 channels of pixel data. Major rewrite by Kornel Lesiński, adding double precision, dithering, better handling of alpha transparency and more. Thanks! This program has been tested on: Linux 32 and 64 bit Mac OSX - intel processor. OpenBSD 32 bit Win32 REQUIREMENTS: Pngnq depends on the libpng and libz libraries. You will need libpng >=1.2.8 installed. If you have this then you will have libz. On windows you will require the libpng13.dll which can be downloaded from several sites. BUGS: Some problems with greyscale alpha images at low bit depths. TODO list: I want to change the error measure to use CIE u' v' color space and see if results are visually better. Limited image input formats. I am not doing much checking on the image pixel depth etc. Do a detailed comparison with other quantization algortithms. - the pngcomp tool is in development to do this. 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The output file name is the input file name extended with "-nq8.png" or a specified extension. .SH OPTIONS .IP -v Verbose mode. Prints status messages. .IP -f Force ovewriting of files. .IP "-s sample factor" Sample factor. The neuquant algorithm samples pixels stepping by this value. The default value of 3 gives good results. Higher values sample less of the image pixels and thus are faster but less accurate. A factor of 1 samples every image pixel. .IP "-n colors" Specifies the number of colors to quantize to. Defaults to 256 which is the maximum. The minimum here is 2. .IP "-Q dither" Choose a dithering method: n = no dither (default), f = Floyd Steinberg dithering. .IP "-g gamma" Set the image gamma correction. If not present, uses the png file's gamma or defaults to 1.0. .IP "-e extension" Specifies the new filename extension. Defaults to "-nq8.png". Pngnq drops .png from the original filenames. If you set the argument of the -e option to .png and choose the -f option the input file will be overwritten. .IP "-d dir" Tells pngnq to put output files in a directory other than the one the input files are in. .IP "input files" The png files to be processed. Defaults to standard input if not specified. 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All rights reserved. This software is provided "as is," without warranty of any kind, express or implied. In no event shall the author or contributors be held liable for any damages arising in any way from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. Redistributions of source code must retain the above copyright notice, disclaimer, and this list of conditions. 2. Redistributions in binary form must reproduce the above copyright notice, disclaimer, and this list of conditions in the documenta- tion and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgment: This product includes software developed by Greg Roelofs and contributors for the book, "PNG: The Definitive Guide," published by O'Reilly and Associates. --------------------------------------------------------------------------- NeuQuant Neural-Net Quantization Algorithm Copyright (c) 1994 Anthony Dekker NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994. See "Kohonen neural networks for optimal colour quantization" in "Network: Computation in Neural Systems" Vol. 5 (1994) pp 351-367. for a discussion of the algorithm. See also http://members.ozemail.com.au/~dekker/NEUQUANT.HTML Any party obtaining a copy of these files from the author, directly or indirectly, is granted, free of charge, a full and unrestricted irrevocable, world-wide, paid up, royalty-free, nonexclusive right and license to deal in this software and documentation files (the "Software"), including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons who receive copies from any such party to do so, with the only requirement being that this copyright notice remain intact. ---------------------------------------------------------------------------- Free Getopt Copyright (c)2002-2003 Mark K. Kim All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the original author of this software nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. pngnq-1.0/ChangeLog0000644000175000017500000000043611204771040011167 00000000000000May 2009: Version 1.0 release. Moved to using Kornel Lesiński's codebase. Many changes since 0.5. - Gamma value option. - Scaling of alpha channel response to give more colors to opaque . - Checked with valgrind. - pngnq-1.0/INSTALL0000644000175000017500000000077111204771040010450 00000000000000INSTALLATION INSTRUCTIONS: This should work on most UNIX style systems: ./configure make sudo make install NOTES: There may be warnings about strings being too long. Unless you have a really ancient compiler these can be safely ignored. If you really don't like warnings add --std=c99 to the CFLAGS or get rid of --pedantic. If you successfully build this on a system other than those listed below please tell me. Also tell me if it does not work. Cheers, Stuart Coyle stuart@cybertherial.com pngnq-1.0/NEWS0000644000175000017500000000026511206333261010115 00000000000000PNGNQ Release Notes 1.0 - Added PorneL's improvements. These include dithering, gamma correction. Checked with pngsuite images. 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You may also peek at any GNU archive site, in case some other package would contain this missing \`$1' program." exit 1 ;; esac exit 0 # Local variables: # eval: (add-hook 'write-file-hooks 'time-stamp) # time-stamp-start: "scriptversion=" # time-stamp-format: "%:y-%02m-%02d.%02H" # time-stamp-end: "$" # End: pngnq-1.0/freegetopt/0000777000175000017500000000000011217143475011653 500000000000000pngnq-1.0/freegetopt/README0000644000175000017500000000346011204771035012445 00000000000000Free Getopt ****************************************************************************** Please read the file LICENSE for the terms of use and distribution of this software. ****************************************************************************** "getopt" is a library that allows a parsing of arguments passed to a program. This is a useful library used in many software. There are many versions of the getopt library available, two popular versions being the BSD getopt and the GNU getopt. BSD getopt is somewhat old, dated, and isn't very user-friendly. The GNU getopt is great, except the user license doesn't let you statically link the library to a proprietary software. This is usually not a problem on modern operating systems that allow dynamic links to libraries, but sometimes you just gotta link the library statically for one reason or another. That's where Free Getopt steps in. Functionally, this getopt library is equivalent to GNU's getopt library (the short option version, not the long one) in almost every aspect. The only exception is how the "optind" variable increments. Apparently due to different algorithms used by my program and the GNU getopt, the "optind" changes quite differently between our two software. I personally find my algorithm to be quite elegant; I couldn't tell you about the GNU version since I never looked at its source. GNU's getopt_long support is in progress. This library was deliberately left in non-library (not in *.lib, *.so, or *.a) form because it's most likely to be statically-linked in various platforms, and linking it directly from source is probably the most straight-forward way to use the software in any platform. I hope you find this software useful. Mark K. 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Kim {getopt*cbreak.org} * *: freegetopt 0.11 released. 2003-10-25 Mark K. Kim {getopt*cbreak.org} * ChangeLog: ChangeLog file added. * LICENSE: License file added. License is now officially BSD. * README: Updated to reflect the new license. CVS tracking data added. * getopt.h, getopt.c: License text added to the beginning of each file. CVS tracking data added. * test.c: License text added to the beginning of the file. CVS tracking data added. 2003-10-20 Mark K. Kim {getopt*cbreak.org} * *: Sourceforge project approval. Name changed to freegetopt. License is now officially BSD. 2003-09-29 Jon Higdon {jhigdon*nni.com} * test.c: GCC 3.x gives compound statement warning. Fixed. 2003.01.12 Mark K. Kim {getopt*cbreak.org} * *: Getopt 1.0 released! Supports only short options, but I think it's fully compatible with GNU getopt except for the value of optind while getopt is still running. 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Generated from configure.ac by autoheader. */ /* Define to 1 if you have the header file. */ #undef HAVE_CTYPE_H /* Define to 1 if you have the header file. */ #undef HAVE_FCNTL_H /* Define to 1 if you have the `floor' function. */ #undef HAVE_FLOOR /* Define to 1 if you have the `getopt' function. */ #undef HAVE_GETOPT /* Define to 1 if you have the header file. */ #undef HAVE_INTTYPES_H /* Define to 1 if your system has a GNU libc compatible `malloc' function, and to 0 otherwise. */ #undef HAVE_MALLOC /* Define to 1 if you have the `memmove' function. */ #undef HAVE_MEMMOVE /* Define to 1 if you have the header file. */ #undef HAVE_MEMORY_H /* Define to 1 if you have the `memset' function. */ #undef HAVE_MEMSET /* Define to 1 if you have the `pow' function. */ #undef HAVE_POW /* Define to 1 if you have the `sqrt' function. */ #undef HAVE_SQRT /* Define to 1 if `stat' has the bug that it succeeds when given the zero-length file name argument. */ #undef HAVE_STAT_EMPTY_STRING_BUG /* Define to 1 if stdbool.h conforms to C99. */ #undef HAVE_STDBOOL_H /* Define to 1 if you have the header file. */ #undef HAVE_STDINT_H /* Define to 1 if you have the header file. */ #undef HAVE_STDLIB_H /* Define to 1 if you have the `strchr' function. */ #undef HAVE_STRCHR /* Define to 1 if you have the header file. */ #undef HAVE_STRINGS_H /* Define to 1 if you have the header file. */ #undef HAVE_STRING_H /* Define to 1 if you have the `strrchr' function. */ #undef HAVE_STRRCHR /* Define to 1 if you have the header file. */ #undef HAVE_SYS_STAT_H /* Define to 1 if you have the header file. */ #undef HAVE_SYS_TIME_H /* Define to 1 if you have the header file. */ #undef HAVE_SYS_TYPES_H /* Define to 1 if you have the header file. */ #undef HAVE_UNISTD_H /* Define to 1 if you have the header file. */ #undef HAVE_VALGRIND_CALLGRIND_H /* Define to 1 if the system has the type `_Bool'. */ #undef HAVE__BOOL /* Define to 1 if `lstat' dereferences a symlink specified with a trailing slash. */ #undef LSTAT_FOLLOWS_SLASHED_SYMLINK /* Name of package */ #undef PACKAGE /* Define to the address where bug reports for this package should be sent. */ #undef PACKAGE_BUGREPORT /* Define to the full name of this package. */ #undef PACKAGE_NAME /* Define to the full name and version of this package. */ #undef PACKAGE_STRING /* Define to the one symbol short name of this package. */ #undef PACKAGE_TARNAME /* Define to the version of this package. */ #undef PACKAGE_VERSION /* Define to 1 if you have the ANSI C header files. */ #undef STDC_HEADERS /* Version number of package */ #undef VERSION /* Define to empty if `const' does not conform to ANSI C. */ #undef const /* Define to rpl_malloc if the replacement function should be used. */ #undef malloc pngnq-1.0/src/pngcomp.c0000644000175000017500000003304711204770677012036 00000000000000/* pngcomp.c A simple test program for png image quantisation. This program compares the pixel colors of two images and prints out statistics on the differences between the images. Statistics printed include: mean error standard deviation of error maximum error The error is calculated as the linear distance between two colors in RGBA space. ** Copyright (C) 2006-2007 by Stuart Coyle ** ** Permission to use, copy, modify, and distribute this software and its ** documentation for any purpose and without fee is hereby granted, provided ** that the above copyright notice appear in all copies and that both that ** copyright notice and this permission notice appear in supporting ** documentation. This software is provided "as is" without express or ** implied warranty. */ #define PNGCOMP_USAGE "usage: pngcomp [-vVh] image1.png image2.png\n\ options: v - verbose, does nothing as yet.\n\ V - version, prints version information.\n\ h - help, prionts this message.\n\ b - Block size in pixels. This is the length of the block side.\n\ R - Use RGBA colorspace to calculate errors.\n\ L - Use LUVA colorspace to calculate errors.\n\ inputs: image1.png and image2.png are the two images that are to be compared.\n\ it is required that they be the same size.\n\ \n\ This program give some basic statistics about the difference between two images.\n\ It was created as a measure of various color quantization methods.\n\ \n\ The statistics given include individual pixel differences and also\n\ block statistics averaged over blocks of pixels. The latter is a better measure\n\ when images have been dithered.\n\ \n\ The use of these statistics is limited in that they do not contain a model of human vision." #define MAX_COLOR_VAL 256 #define SQRT_3 1.73205 #include #include #include #include #include #include #include "png.h" #include "config.h" #include "rwpng.h" #include "colorspace.h" #if HAVE_GETOPT #include #else #include "../freegetopt/getopt.h" #endif typedef struct { uch r, g, b, a; } pixel; struct statistics { char *colorspace; double max_error; double mean_error; double stddev_error; ulg n_pixels; ulg correct_pixels; }; struct blockstats { char* colorspace; int blocksize; double max_error; double mean_error; double stddev_error; ulg n_blocks; }; /* Image information structs */ static mainprog_info image1_info; static mainprog_info image2_info; float *imagediff(char* file1_name, char* file2_name); float *block_imagediff(char* file1_name, char* file2_name,int blocksize); struct statistics *gather_stats(float *error_data); struct blockstats *gather_block_stats(float *block_error_data, int blocksize); void printstats(struct statistics* stats, struct blockstats* bstats); float LUVerrval(pixel *p1, pixel *p2); float RGBerrval(pixel *p1, pixel *p2); /* Error value callback */ typedef float errval_t(pixel *, pixel *); errval_t* errval; int main(int argc, char** argv) { int verbose = 0; int blocksize = 16; char *file1_name = NULL; char *file2_name = NULL; int c; /* argument count */ int retval = 0; float* err_image = NULL; float* block_err_image = NULL; errval = RGBerrval; char *colorspace = "RGBA"; /* Parse arguments */ if(argc==1){ fprintf(stderr,PNGCOMP_USAGE); exit(EXIT_SUCCESS); } while((c = getopt(argc,argv,"hVvb:RL"))!=-1){ switch(c){ case 'v': verbose = 1; break; case 'V': fprintf(stderr,"pngcomp %s\n",VERSION); rwpng_version_info(); exit(EXIT_SUCCESS); break; case 'h': fprintf(stderr,PNGCOMP_USAGE); exit(EXIT_SUCCESS); break; case 'b': blocksize = atoi(optarg); break; case 'R': errval = RGBerrval; colorspace = "RGBA"; break; case 'L': errval = LUVerrval; colorspace ="LUVA"; break; case '?': if (isprint(optopt)) fprintf (stderr, " unknown option `-%c'.\n", optopt); else fprintf (stderr, " unknown option character `\\x%x'.\n", optopt); default: fprintf(stderr,PNGCOMP_USAGE); exit(EXIT_FAILURE); } } /* determine input files */ if(optind == argc){ fprintf(stderr," pngcomp requires two input file names.\n"); exit(EXIT_FAILURE); } else{ file1_name=argv[optind]; optind++; if(optind == argc){ fprintf(stderr," pngcomp requires two file names.\n"); exit(EXIT_FAILURE); } else{ file2_name=argv[optind]; optind++; } } err_image = imagediff(file1_name,file2_name); block_err_image = block_imagediff(file1_name,file2_name,blocksize); if(err_image != NULL){ struct statistics *stats = gather_stats(err_image); struct blockstats *bstats = gather_block_stats(err_image,blocksize); stats->colorspace = colorspace; bstats->colorspace = colorspace; printstats(stats,bstats); } exit(retval); } float *imagediff(char* file1_name, char* file2_name){ FILE *file1 = NULL; FILE *file2 = NULL; ulg cols, rows; ulg row; float* error_data = NULL; /* Open the image files */ if((file1 = fopen(file1_name, "rb"))==NULL){ fprintf(stderr," error: cannot open %s for reading.\n",file1_name); fflush(stderr); return NULL; } if((file2 = fopen(file2_name, "rb"))==NULL){ fprintf(stderr," error: cannot open %s for reading.\n",file2_name); fflush(stderr); return NULL; } /* Read each image */ rwpng_read_image(file1,&image1_info); fclose(file1); if (image1_info.retval) { fprintf(stderr, " rwpng_read_image() error\n"); fflush(stderr); return NULL; } rwpng_read_image(file2,&image2_info); fclose(file2); if (image2_info.retval) { fprintf(stderr, " rwpng_read_image() error\n"); fflush(stderr); return NULL; } /* Can't do images that differ in size */ /* Is there any point? */ cols = image1_info.width; rows= image1_info.height; if(image2_info.width != cols || image2_info.height != rows){ fprintf(stderr, " images differ in size. cannot continue. \n"); return(NULL); } if(!image1_info.rgba_data || !image2_info.rgba_data) { fprintf(stderr," no pixel data found."); return(NULL); } error_data = (float *)calloc(cols*rows*sizeof(float),sizeof(float)); if(error_data == NULL){ fprintf(stderr," cannot allocate error buffer."); return(NULL); } /* Calculate error value for each pixel */ for(row=0;(ulg)row < rows; ++row){ int col; pixel p1, p2; ulg offset = row*cols*4; for( col=0;(ulg)colr-p2->r; long err_g = p1->g-p2->g; long err_b = p1->b-p2->b; long err_a = p1->a-p2->a; err = err_r*err_r + err_g*err_g + err_b*err_b+ err_a*err_a; return sqrt((double)err); } /* Calculates cartesian distance of pixels in LUVa space */ float LUVerrval(pixel *p1, pixel *p2){ color_LUV c1; color_LUV c2; color_rgb r1; color_rgb r2; r1.r = p1->r; r1.g = p1->g; r1.b = p1->b; r2.r = p2->r; r2.g = p2->g; r2.b = p2->b; rgb2LUV(&r1,&c1,NULL); rgb2LUV(&r2,&c2,NULL); long err; long err_L = c1.L-c2.L; long err_u = c1.U-c2.U; long err_v = c1.V-c2.V; long err_a = p1->a-p2->a; err = err_L*err_L + err_u*err_u + err_v*err_v+ err_a*err_a; return sqrt((double)err); } struct statistics *gather_stats(float *error_data){ int count; struct statistics *stats = malloc(sizeof(struct statistics)); if(stats == NULL){ fprintf(stderr," Cannot allocate statistics struct."); return(NULL); } stats->max_error = 0.0; stats->mean_error = 0.0; stats->stddev_error = 0.0; stats->n_pixels = image1_info.width*image1_info.height; stats->correct_pixels = (ulg)0; /* Basic stats */ for(count=0;countn_pixels;count++){ float err = error_data[count]; if(err > stats->max_error) stats->max_error = err; stats->mean_error += err; if(err <= 0.0) stats->correct_pixels++; } stats->mean_error = (float)(stats->mean_error)/(float)(stats->n_pixels); /* Standard deviation */ for(count=0;countn_pixels;count++){ double err= error_data[count]; stats->stddev_error += (err-stats->mean_error)*(err-stats->mean_error); } stats->stddev_error = sqrt(stats->stddev_error)/stats->n_pixels; return stats; } struct blockstats *gather_block_stats(float *block_error_data,int blocksize){ int count; struct blockstats *stats = malloc(sizeof(struct blockstats)); if(stats == NULL){ fprintf(stderr," Cannot allocate block statistics struct."); return(NULL); } stats->blocksize = blocksize; stats->max_error = 0.0; stats->mean_error = 0.0; stats->stddev_error = 0.0; stats->n_blocks = image1_info.width*image1_info.height/(blocksize*blocksize); /* Basic stats */ for(count=0;countn_blocks;count++){ float err = block_error_data[count*blocksize*blocksize]; if(err > stats->max_error) stats->max_error = err; stats->mean_error += err; } stats->mean_error = (float)(stats->mean_error)/(float)(stats->n_blocks); /* Standard deviation */ for(count=0;countn_blocks;count++){ double err= block_error_data[count*blocksize*blocksize]; stats->stddev_error += (err-stats->mean_error)*(err-stats->mean_error); } stats->stddev_error = sqrt(stats->stddev_error)/(stats->n_blocks); return stats; } void printstats(struct statistics* stats, struct blockstats* bstats){ printf("%s image color difference statistics.\n",stats->colorspace); printf("Mean pixel color error: %f \n",stats->mean_error); printf("Maximum pixel color error: %f \n",stats->max_error); printf("Standard Deviation of error: %f\n",stats->stddev_error); printf("Image Dimensions %ld x %ld \n",image1_info.width,image1_info.height); printf("Number of pixels: %ld \n",stats->n_pixels); printf("Number of exact pixels: %ld\n",stats->correct_pixels); printf("Percentage correct pixels: %f\n",(float)stats->correct_pixels/(float)stats->n_pixels*100.0); printf("\n"); printf("%s image color block difference statistics.\n",bstats->colorspace); printf("Blocksize %d x %d = %d pixels\n",bstats->blocksize,bstats->blocksize, bstats->blocksize*bstats->blocksize); printf("Mean block color error: %f \n",bstats->mean_error); printf("Maximum block color error: %f \n",bstats->max_error); printf("Standard Deviation of block error: %f\n",bstats->stddev_error); printf("Total number of blocks: %ld\n",bstats->n_blocks); } pngnq-1.0/src/rwpng.c0000644000175000017500000004526111204770677011531 00000000000000/*--------------------------------------------------------------------------- pngquant: RGBA -> RGBA-palette quantization program rwpng.c --------------------------------------------------------------------------- Copyright (c) 1998-2000 Greg Roelofs. All rights reserved. This software is provided "as is," without warranty of any kind, express or implied. In no event shall the author or contributors be held liable for any damages arising in any way from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. Redistributions of source code must retain the above copyright notice, disclaimer, and this list of conditions. 2. Redistributions in binary form must reproduce the above copyright notice, disclaimer, and this list of conditions in the documenta- tion and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgment: This product includes software developed by Greg Roelofs and contributors for the book, "PNG: The Definitive Guide," published by O'Reilly and Associates. ---------------------------------------------------------------------------*/ #include #include #include "png.h" /* libpng header; includes zlib.h */ #include "rwpng.h" /* typedefs, common macros, public prototypes */ /* future versions of libpng will provide this macro: */ /* GRR NOTUSED */ #ifndef png_jmpbuf # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) #endif static void rwpng_error_handler(png_structp png_ptr, png_const_charp msg); void rwpng_version_info(void) { fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver); fprintf(stderr, " Compiled with zlib %s; using zlib %s.\n", ZLIB_VERSION, zlib_version); } /* retval: 0 = success 21 = bad sig 22 = bad IHDR 24 = insufficient memory 25 = libpng error (via longjmp()) 26 = wrong PNG color type (no alpha channel) */ int rwpng_read_image(FILE *infile, mainprog_info *mainprog_ptr) { png_structp png_ptr = NULL; png_infop info_ptr = NULL; png_uint_32 i, rowbytes; int color_type, bit_depth; uch sig[8]; png_color_16p background; int num_comments; int c; png_text *comments; /* first do a quick check that the file really is a PNG image; could * have used slightly more general png_sig_cmp() function instead */ fread(sig, 1, 8, infile); if (!png_check_sig(sig, 8)) { mainprog_ptr->retval = 21; /* bad signature */ return mainprog_ptr->retval; } png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr, rwpng_error_handler, NULL); if (!png_ptr) { mainprog_ptr->retval = 24; /* out of memory */ return mainprog_ptr->retval; } mainprog_ptr->png_ptr = png_ptr; info_ptr = png_create_info_struct(png_ptr); if (!info_ptr) { png_destroy_read_struct(&png_ptr, NULL, NULL); mainprog_ptr->retval = 24; /* out of memory */ return mainprog_ptr->retval; } mainprog_ptr->info_ptr = info_ptr; /* GRR TO DO: use end_info struct */ /* we could create a second info struct here (end_info), but it's only * useful if we want to keep pre- and post-IDAT chunk info separated * (mainly for PNG-aware image editors and converters) */ /* setjmp() must be called in every function that calls a non-trivial * libpng function */ if (setjmp(mainprog_ptr->jmpbuf)) { png_destroy_read_struct(&png_ptr, &info_ptr, NULL); mainprog_ptr->retval = 25; /* fatal libpng error (via longjmp()) */ return mainprog_ptr->retval; } png_init_io(png_ptr, infile); png_set_sig_bytes(png_ptr, 8); /* we already read the 8 signature bytes */ png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */ /* alternatively, could make separate calls to png_get_image_width(), * etc., but want bit_depth and color_type for later [don't care about * compression_type and filter_type => NULLs] */ png_get_IHDR(png_ptr, info_ptr, &mainprog_ptr->width, &mainprog_ptr->height, &bit_depth, &color_type, &mainprog_ptr->interlaced, NULL, NULL); /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits, * transparency chunks to full alpha channel; strip 16-bit-per-sample * images to 8 bits per sample; and convert grayscale to RGB[A] */ /* GRR TO DO: handle each of GA, RGB, RGBA without conversion to RGBA */ /* GRR TO DO: allow sub-8-bit quantization? */ /* GRR TO DO: preserve all safe-to-copy ancillary PNG chunks */ /* GRR TO DO: get and map background color? */ if (!(color_type & PNG_COLOR_MASK_ALPHA)) { #ifdef PNG_READ_FILLER_SUPPORTED /* GRP: expand palette to RGB, and grayscale or RGB to GA or RGBA */ if (color_type == PNG_COLOR_TYPE_PALETTE) png_set_expand(png_ptr); png_set_filler(png_ptr, 65535L, PNG_FILLER_AFTER); #else fprintf(stderr, "pngnq readpng: image is neither RGBA nor GA\n"); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); mainprog_ptr->retval = 26; return mainprog_ptr->retval; #endif } if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) png_set_expand(png_ptr); if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) png_set_expand(png_ptr); /* GRR TO DO: handle 16-bps data natively? */ if (bit_depth == 16) png_set_strip_16(png_ptr); /* GRR TO DO: probably want to handle this separately, without expansion */ if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA) png_set_gray_to_rgb(png_ptr); /* get and save the gamma info (if any) for writing */ mainprog_ptr->gamma = 0.0; png_get_gAMA(png_ptr, info_ptr, &mainprog_ptr->gamma); /* Get background color */ if(png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD)) { mainprog_ptr->have_bg = TRUE; png_get_bKGD(png_ptr, info_ptr, &background); mainprog_ptr->bg_red = background->red; mainprog_ptr->bg_green = background->green; mainprog_ptr->bg_blue = background->blue; } /* all transformations have been registered; now update info_ptr data, * get rowbytes and channels, and allocate image memory */ png_read_update_info(png_ptr, info_ptr); mainprog_ptr->rowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr); mainprog_ptr->channels = (int)png_get_channels(png_ptr, info_ptr); if ((mainprog_ptr->rgba_data = (uch *)malloc(rowbytes*mainprog_ptr->height)) == NULL) { fprintf(stderr, "pngquant readpng: unable to allocate image data\n"); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); mainprog_ptr->retval = 24; return mainprog_ptr->retval; } if ((mainprog_ptr->row_pointers = (png_bytepp)malloc(mainprog_ptr->height*sizeof(png_bytep))) == NULL) { fprintf(stderr, "pngquant readpng: unable to allocate row pointers\n"); png_destroy_read_struct(&png_ptr, &info_ptr, NULL); free(mainprog_ptr->rgba_data); mainprog_ptr->rgba_data = NULL; mainprog_ptr->retval = 24; return mainprog_ptr->retval; } Trace((stderr, "readpng_get_image: channels = %d, rowbytes = %ld, height = %ld\n", mainprog_ptr->channels, rowbytes, mainprog_ptr->height)); /* set the individual row_pointers to point at the correct offsets */ for (i = 0; i < mainprog_ptr->height; ++i) mainprog_ptr->row_pointers[i] = mainprog_ptr->rgba_data + i*rowbytes; /* now we can go ahead and just read the whole image */ png_read_image(png_ptr, (png_bytepp)mainprog_ptr->row_pointers); /* and we're done! (png_read_end() can be omitted if no processing of * post-IDAT text/time/etc. is desired) */ png_read_end(png_ptr, NULL); /* read text + time */ num_comments = png_get_text(png_ptr, info_ptr, &comments, NULL); if(num_comments){ mainprog_ptr->have_text = 1; for(c = 0; c < num_comments; c++){ if(!strncmp("author",comments[c].key,6)){ mainprog_ptr->author = comments[c].text; } } }; png_destroy_read_struct(&png_ptr, &info_ptr, NULL); mainprog_ptr->png_ptr = NULL; mainprog_ptr->info_ptr = NULL; mainprog_ptr->retval = 0; return 0; } /* retval: 0 = success 34 = insufficient memory 35 = libpng error (via longjmp()) */ int rwpng_write_image_init(FILE *outfile, mainprog_info *mainprog_ptr) { png_structp png_ptr; /* note: temporary variables! */ png_infop info_ptr; /* could also replace libpng warning-handler (final NULL), but no need: */ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr, rwpng_error_handler, NULL); if (!png_ptr) { mainprog_ptr->retval = 34; /* out of memory */ return mainprog_ptr->retval; } mainprog_ptr->png_ptr = png_ptr; info_ptr = png_create_info_struct(png_ptr); if (!info_ptr) { png_destroy_write_struct(&png_ptr, NULL); mainprog_ptr->retval = 34; /* out of memory */ return mainprog_ptr->retval; } /* setjmp() must be called in every function that calls a PNG-writing * libpng function, unless an alternate error handler was installed-- * but compatible error handlers must either use longjmp() themselves * (as in this program) or exit immediately, so here we go: */ if (setjmp(mainprog_ptr->jmpbuf)) { png_destroy_write_struct(&png_ptr, &info_ptr); mainprog_ptr->retval = 35; /* libpng error (via longjmp()) */ return mainprog_ptr->retval; } /* make sure outfile is (re)opened in BINARY mode */ png_init_io(png_ptr, outfile); /* set the compression levels--in general, always want to leave filtering * turned on (except for palette images) and allow all of the filters, * which is the default; want 32K zlib window, unless entire image buffer * is 16K or smaller (unknown here)--also the default; usually want max * compression (NOT the default); and remaining compression flags should * be left alone */ png_set_compression_level(png_ptr, Z_BEST_COMPRESSION); /* >> this is default for no filtering; Z_FILTERED is default otherwise: png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY); >> these are all defaults: png_set_compression_mem_level(png_ptr, 8); png_set_compression_window_bits(png_ptr, 15); png_set_compression_method(png_ptr, 8); */ /* set the image parameters appropriately */ png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height, mainprog_ptr->sample_depth, PNG_COLOR_TYPE_PALETTE, mainprog_ptr->interlaced, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); /* GRR WARNING: cast of rwpng_colorp to png_colorp could fail in future * major revisions of libpng (but png_ptr/info_ptr will fail, regardless) */ png_set_PLTE(png_ptr, info_ptr, (png_colorp)mainprog_ptr->palette, mainprog_ptr->num_palette); if (mainprog_ptr->num_trans > 0) png_set_tRNS(png_ptr, info_ptr, mainprog_ptr->trans, mainprog_ptr->num_trans, NULL); if (mainprog_ptr->gamma > 0.0) png_set_gAMA(png_ptr, info_ptr, mainprog_ptr->gamma); if (mainprog_ptr->have_bg) { /* we know it's RGBA, not gray+alpha */ png_color_16 background; background.red = mainprog_ptr->bg_red; background.green = mainprog_ptr->bg_green; background.blue = mainprog_ptr->bg_blue; png_set_bKGD(png_ptr, info_ptr, &background); } if (mainprog_ptr->have_time) { png_time modtime; png_convert_from_time_t(&modtime, mainprog_ptr->modtime); png_set_tIME(png_ptr, info_ptr, &modtime); } if (mainprog_ptr->have_text) { png_text text[6]; int num_text = 0; if (mainprog_ptr->have_text & TEXT_TITLE) { text[num_text].compression = PNG_TEXT_COMPRESSION_NONE; text[num_text].key = "Title"; text[num_text].text = mainprog_ptr->title; ++num_text; } if (mainprog_ptr->have_text & TEXT_AUTHOR) { text[num_text].compression = PNG_TEXT_COMPRESSION_NONE; text[num_text].key = "Author"; text[num_text].text = mainprog_ptr->author; ++num_text; } if (mainprog_ptr->have_text & TEXT_DESC) { text[num_text].compression = PNG_TEXT_COMPRESSION_NONE; text[num_text].key = "Description"; text[num_text].text = mainprog_ptr->desc; ++num_text; } if (mainprog_ptr->have_text & TEXT_COPY) { text[num_text].compression = PNG_TEXT_COMPRESSION_NONE; text[num_text].key = "Copyright"; text[num_text].text = mainprog_ptr->copyright; ++num_text; } if (mainprog_ptr->have_text & TEXT_EMAIL) { text[num_text].compression = PNG_TEXT_COMPRESSION_NONE; text[num_text].key = "E-mail"; text[num_text].text = mainprog_ptr->email; ++num_text; } if (mainprog_ptr->have_text & TEXT_URL) { text[num_text].compression = PNG_TEXT_COMPRESSION_NONE; text[num_text].key = "URL"; text[num_text].text = mainprog_ptr->url; ++num_text; } png_set_text(png_ptr, info_ptr, text, num_text); } /* write all chunks up to (but not including) first IDAT */ png_write_info(png_ptr, info_ptr); /* if we wanted to write any more text info *after* the image data, we * would set up text struct(s) here and call png_set_text() again, with * just the new data; png_set_tIME() could also go here, but it would * have no effect since we already called it above (only one tIME chunk * allowed) */ /* set up the transformations: for now, just pack low-bit-depth pixels * into bytes (one, two or four pixels per byte) */ png_set_packing(png_ptr); /* png_set_shift(png_ptr, &sig_bit); to scale low-bit-depth values */ /* make sure we save our pointers for use in writepng_encode_image() */ mainprog_ptr->png_ptr = png_ptr; mainprog_ptr->info_ptr = info_ptr; /* OK, that's all we need to do for now; return happy */ mainprog_ptr->retval = 0; return 0; } /* this routine is called only for interlaced images */ /* returns 0 for success, 45 for libpng (longjmp) problem */ int rwpng_write_image_whole(mainprog_info *mainprog_ptr) { png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr; png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr; /* as always, setjmp() must be called in every function that calls a * PNG-writing libpng function */ if (setjmp(mainprog_ptr->jmpbuf)) { png_destroy_write_struct(&png_ptr, &info_ptr); mainprog_ptr->png_ptr = NULL; mainprog_ptr->info_ptr = NULL; mainprog_ptr->retval = 45; /* libpng error (via longjmp()) */ return mainprog_ptr->retval; } /* and now we just write the whole image; libpng takes care of interlacing * for us */ png_write_image(png_ptr, mainprog_ptr->row_pointers); /* since that's it, we also close out the end of the PNG file now--if we * had any text or time info to write after the IDATs, second argument * would be info_ptr, but we optimize slightly by sending NULL pointer: */ png_write_end(png_ptr, NULL); png_destroy_write_struct(&png_ptr, &info_ptr); mainprog_ptr->png_ptr = NULL; mainprog_ptr->info_ptr = NULL; mainprog_ptr->retval = 0; return 0; } /* this routine is called only for non-interlaced images */ /* returns 0 if succeeds, 55 if libpng problem */ int rwpng_write_image_row(mainprog_info *mainprog_ptr) { png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr; png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr; /* as always, setjmp() must be called in every function that calls a * PNG-writing libpng function */ if (setjmp(mainprog_ptr->jmpbuf)) { png_destroy_write_struct(&png_ptr, &info_ptr); mainprog_ptr->png_ptr = NULL; mainprog_ptr->info_ptr = NULL; mainprog_ptr->retval = 55; /* libpng error (via longjmp()) */ return mainprog_ptr->retval; } /* indexed_data points at our one row of indexed data */ png_write_row(png_ptr, mainprog_ptr->indexed_data); mainprog_ptr->retval = 0; return 0; } /* this routine is called only for non-interlaced images */ /* returns 0 if succeeds, 65 if libpng problem */ int rwpng_write_image_finish(mainprog_info *mainprog_ptr) { png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr; png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr; /* as always, setjmp() must be called in every function that calls a * PNG-writing libpng function */ if (setjmp(mainprog_ptr->jmpbuf)) { png_destroy_write_struct(&png_ptr, &info_ptr); mainprog_ptr->png_ptr = NULL; mainprog_ptr->info_ptr = NULL; mainprog_ptr->retval = 55; /* libpng error (via longjmp()) */ return mainprog_ptr->retval; } /* close out PNG file; if we had any text or time info to write after * the IDATs, second argument would be info_ptr */ png_write_end(png_ptr, NULL); png_destroy_write_struct(&png_ptr, &info_ptr); mainprog_ptr->png_ptr = NULL; mainprog_ptr->info_ptr = NULL; mainprog_ptr->retval = 0; return 0; } static void rwpng_error_handler(png_structp png_ptr, png_const_charp msg) { mainprog_info *mainprog_ptr; /* This function, aside from the extra step of retrieving the "error * pointer" (below) and the fact that it exists within the application * rather than within libpng, is essentially identical to libpng's * default error handler. The second point is critical: since both * setjmp() and longjmp() are called from the same code, they are * guaranteed to have compatible notions of how big a jmp_buf is, * regardless of whether _BSD_SOURCE or anything else has (or has not) * been defined. */ fprintf(stderr, "rwpng libpng error: %s\n", msg); fflush(stderr); mainprog_ptr = png_get_error_ptr(png_ptr); if (mainprog_ptr == NULL) { /* we are completely hosed now */ fprintf(stderr, "rwpng severe error: jmpbuf not recoverable; terminating.\n"); fflush(stderr); exit(99); } longjmp(mainprog_ptr->jmpbuf, 1); } pngnq-1.0/src/colorspace.c0000644000175000017500000000407111204770677012520 00000000000000 #include #include #include #include "colorspace.h" /* Convert from rgb to XYZ colorspace */ /* Note this assumes a D65 whitepoint */ void rgb2XYZ(const color_rgb *rgb, color_XYZ *xyz, const color_XYZ *wp) { /* This is for sRGB D65 whitepoint */ /* TODO calculate values from whitepoint */ float m[3][3] ={{0.412424, 0.212656, 0.0193324}, {0.357579, 0.715158, 0.119193}, {0.180464, 0.0721856, 0.950444}}; xyz->X = (m[0][0]*rgb->r + m[1][0]*rgb->g + m[2][0]*rgb->b)/256.0; xyz->Y = (m[0][1]*rgb->r + m[1][1]*rgb->g + m[2][1]*rgb->b)/256.0; xyz->Z = (m[0][2]*rgb->r + m[1][2]*rgb->g + m[2][2]*rgb->b)/256.0; } /* Convert from XYZ to LUV colorspace */ void XYZ2LUV(color_XYZ *xyz, color_LUV *luv, const color_XYZ *wp) { float u,v; float yref,uref,vref; const float e = 216.0/24389.0; const float k = 24389.0/27.0; if(!wp){ wp = &d65; } /* Reference white point */ uref = 4.0 * wp->X/(wp->X + 15.0 * wp->Y +3.0 * wp->Z); vref = 9.0 * wp->Y/(wp->X + 15.0 * wp->Y +3.0 * wp->Z); yref = xyz->Y/wp->Y; /* Calculate LUV */ u = 4.0 * xyz->X/(xyz->X + 15.0 * xyz->Y + 3.0 * xyz->Z); v = 9.0 * xyz->Y/(xyz->X + 15.0 * xyz->Y + 3.0 * xyz->Z); if(yref>e){ luv->L = 116.0*powf(yref,1.0/3.0)-16.0; }else{ luv->L = k*yref; } luv->U = 13.0*luv->L*(u-uref); luv->V = 13.0*luv->L*(v-vref); } void rgb2LUV(const color_rgb *rgb, color_LUV *luv, const color_XYZ *wp) { color_XYZ xyz; rgb2XYZ(rgb,&xyz,0); XYZ2LUV(&xyz,luv,0); } #if 0 int main(int argv, char **argc){ int r,g,b; color_rgb RGB; color_XYZ XYZ; color_LUV LUV; color_LUV LUV2; for(r=0;r<255;r+=16){ for(g=0;g<255;g+=16){ for(b=0;b<255;b+=16){ RGB.r=r; RGB.g=g; RGB.b=b; rgb2XYZ(&RGB, &XYZ, 0); XYZ2LUV(&XYZ, &LUV, 0); printf("(%d, %d, %d)\t(%f,%f,%f)\t(%f,%f,%f)\n", RGB.r,RGB.g,RGB.b,XYZ.X,XYZ.Y,XYZ.Z,LUV.L,LUV.U,LUV.V); rgb2LUV(&RGB, &LUV2, 0); } } } return(0); } #endif pngnq-1.0/src/colorspace.h0000644000175000017500000000165211204770677012527 00000000000000/* colorspace.h Defines conversions between various colorspaces */ typedef struct { unsigned char r, g, b; } color_rgb; typedef struct { float X,Y,Z; } color_XYZ; typedef struct { float L,U,V; } color_LUV; /* Standard white points These are all defined in the CIE XYZ colorspace. */ /* If the whitepoint is passed as NULL d65 is the default */ static color_XYZ d65 = {0.94810,1.0000,1.07305}; static color_XYZ d00 = {0.0, 0.0, 0.0}; /* Convert rgb to a CIE XYZ color, using the supplied white point result is stored in xyz */ void rgb2XYZ(const color_rgb *rgb, color_XYZ *xyz, const color_XYZ *wp); /* Convert an XYZ color to an LUV color result is stored in luv */ void XYZ2LUV(color_XYZ *xyz, color_LUV *luv, const color_XYZ *wp); /* Convert rgb to a CIE XYZ color, using the supplied white point result is stored in luv */ void rgb2LUV(const color_rgb *rgb, color_LUV *luv, const color_XYZ *wp); pngnq-1.0/src/pngnq.c0000644000175000017500000005213711204770677011517 00000000000000/* pngnq.c - quantize the colors in an alphamap down to 256 using ** the Neuquant algorithm. ** ** Based on Greg Roelf's pngquant which was itself based on Jef Poskanzer's ppmquant. ** Uses Anthony Dekker's Neuquant algorithm extended to handle the alpha channel. ** Rewritten by Kornel Lesiński (2009) ** ** Copyright (C) 1989, 1991 by Jef Poskanzer. ** Copyright (C) 1997, 2000, 2002 by Greg Roelofs; based on an idea by ** Stefan Schneider. ** Copyright (C) 2004-2009 by Stuart Coyle ** Copyright (C) Kornel Lesiński (2009) ** Permission to use, copy, modify, and distribute this software and its ** documentation for any purpose and without fee is hereby granted, provided ** that the above copyright notice appear in all copies and that both that ** copyright notice and this permission notice appear in supporting ** documentation. This software is provided "as is" without express or ** implied warranty. */ /* NeuQuant Neural-Net Quantization Algorithm * ------------------------------------------ * * Copyright (c) 1994 Anthony Dekker * * NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994. * See "Kohonen neural networks for optimal colour quantization" * in "Network: Computation in Neural Systems" Vol. 5 (1994) pp 351-367. * for a discussion of the algorithm. * See also http://members.ozemail.com.au/~dekker/NEUQUANT.HTML * * Any party obtaining a copy of these files from the author, directly or * indirectly, is granted, free of charge, a full and unrestricted irrevocable, * world-wide, paid up, royalty-free, nonexclusive right and license to deal * in this software and documentation files (the "Software"), including without * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons who receive * copies from any such party to do so, with the only requirement being * that this copyright notice remain intact. * */ #define PNGNQ_VERSION VERSION //"0.9 ($Date: 2009-01-25 22:39:19 +0000 (Sun, 25 Jan 2009) $)" #define FNMAX 1024 #define PNGNQ_USAGE "\ Usage: pngnq [-vfhV][-e ext.][-d dir][-g gamma][-s speed][-Q dither][-n colours][input files]\n\ Options:\n\ -n Number of colours the quantized image is to contain. Range: 16 to 256. Defaults to 256.\n\ -f Force ovewriting of files.\n\ -Q Quantization: n = no dithering (default), f = floyd-steinberg\n\ -s Speed/quality: 1 = slow, best quality, 3 = good quality, 10 = fast, lower quality.\n\ -g Image gamma. 1.0 = linear, 2.2 = monitor gamma. Defaults to 1.8.\n\ -e Specify the new extension for quantized files. Default -nq8.png\n\ -d Directory to put quantized images into.\n\ -v Verbose mode. Prints status messages.\n\ -V Print version number and library versions.\n\ -h Print this help.\n\n\ input files: The png files to be processed. Defaults to standard input if not specified.\n\n\ \ Quantizes a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG\n\ using the neuquant algorithm. The output file name is the input file name\n\ extended with \"-nq8.png\"\n" #include "config.h" #include #include #include #include /* isprint() and features.h */ #if HAVE_GETOPT # include #else # include "../freegetopt/getopt.h" #endif #if HAVE_VALGRIND_H # include #endif #if defined(WIN32) || defined(MSDOS) # include /* O_BINARY */ # include /* setmode() */ # define DIR_SEPARATOR_CHAR '\\' # define DIR_SEPARATOR_STR "\\" #endif #ifndef DIR_SEPARATOR_CHAR # define DIR_SEPARATOR_CHAR '/' # define DIR_SEPARATOR_STR "/" #endif #include "png.h" #include "neuquant32.h" #include "rwpng.h" #include "errors.h" typedef struct { uch r, g, b, a; } pixel; /* Image information struct */ static mainprog_info rwpng_info; static int pngnq(char* filename, char* newext, char* dir, int sample_factor, int n_colors, int verbose, int using_stdin, int force, int use_floyd, double force_gamma); int main(int argc, char** argv) { int verbose = 0; int force = 0; int sample_factor = 0; /* will be set depending on image size */ char *input_file_name = NULL; char *output_file_extension = "-nq8.png"; char *output_directory = NULL; int using_stdin = FALSE; int c; /* argument character */ int errors = 0, file_count =0; int retval; int n_colours = 256; /* number of colours to quantize to. Default 256 */ int use_floyd = 0; double force_gamma = 0; /* Parse arguments */ while((c = getopt(argc,argv,"hVvfn:s:d:e:g:Q:"))!=-1){ switch(c){ case 's': sample_factor = atoi(optarg); break; case 'v': verbose = 1; break; case 'f': force = 1; break; case 'V': verbose = 1; PNGNQ_MESSAGE("pngnq %s\n",PNGNQ_VERSION); rwpng_version_info(); exit(EXIT_SUCCESS); break; case 'h': fprintf(stderr,PNGNQ_USAGE); exit(EXIT_SUCCESS); break; case 'n': n_colours = atoi(optarg); if(n_colours > 256){ PNGNQ_WARNING(" -n option requested %d colors.\n PNG indexed images cannot contain more than 256 colours.\n Setting the number of colours to 256!\n",n_colours); n_colours = 256; }else if(n_colours<2){ PNGNQ_WARNING(" -n option requested %d colors, which is silly.\n Setting number of colors to the minimum value of 1!\n",n_colours); n_colours = 1; } break; case 'g': force_gamma = atof(optarg); if (force_gamma <= 0.001 || force_gamma > 10.0) { PNGNQ_WARNING("Gamma %s doesn't make sense. Setting to 1.0\n",optarg); force_gamma=1.0; } break; case 'Q': if (optarg[0] == 'f') use_floyd = 1; else if (optarg[0] == 'n') use_floyd = 0; else PNGNQ_WARNING("There's no quantization method %s\n",optarg); break; case 'd': output_directory = optarg; break; case 'e': output_file_extension = optarg; break; default: fprintf(stderr,PNGNQ_USAGE); exit(EXIT_FAILURE); } } PNGNQ_MESSAGE("Using quantization method %d", use_floyd); /* determine input files */ if(optind == argc){ using_stdin = TRUE; input_file_name = "stdin"; } else{ input_file_name=argv[optind]; optind++; } /* Process each input file */ while(optind<=argc) { PNGNQ_MESSAGE(" quantizing: %s \n",input_file_name); retval = pngnq(input_file_name, output_file_extension, output_directory, sample_factor, n_colours, verbose, using_stdin,force,use_floyd,force_gamma); if(retval){ errors++; } input_file_name=argv[optind]; file_count++; optind++; } if (errors) { PNGNQ_MESSAGE("There were errors quantizing %d file%s out of a total of %d file%s.\n", errors, (errors == 1)? "" : "s",file_count, (file_count == 1)? "" : "s"); } else { PNGNQ_MESSAGE("No errors detected while quantizing %d image%s.\n", file_count, (file_count == 1)? "" : "s"); } exit(errors); } /* Creates an output file name based on the input file, extension and directory requested */ char *createoutname(char *infilename, char* newext, char *newdir){ char *outname = NULL; int fn_len, ext_len, dir_len = 0; char *loc; outname = malloc(FNMAX); if (!outname){ PNGNQ_ERROR(" out of memory, cannot allocate output file name\n"); exit(EXIT_FAILURE); } fn_len = strlen(infilename); ext_len = strlen(newext)+1; /* include the terminating NULL*/ if(newdir){ dir_len = strlen(newdir); if(dir_len+fn_len+ext_len > FNMAX){ PNGNQ_WARNING(" directory name too long, ignoring -d option\n"); dir_len = 0; newdir=NULL; } } if(newdir){ /* find the last directory separator */ loc = strrchr(infilename, DIR_SEPARATOR_CHAR); if(loc){ /* strip original directory from filename */ infilename = loc+1; fn_len = strlen(infilename); } /* add a separator to newdir if needed */ if(newdir && newdir[dir_len] != DIR_SEPARATOR_CHAR){ strncpy(newdir+dir_len,DIR_SEPARATOR_STR,1); dir_len++; } /* copy new directory name to output */ strncpy(outname,newdir,dir_len); } if (fn_len > FNMAX-ext_len-dir_len) { PNGNQ_WARNING(" base filename [%s] will be truncated\n", infilename); fn_len = FNMAX-ext_len; } /* copy filename to output */ strncpy(outname+dir_len,infilename,fn_len); /* Add extension */ if (strncmp(outname+dir_len+fn_len-4, ".png", 4) == 0) strncpy(outname+dir_len+fn_len-4, newext, ext_len); else strncpy(outname+dir_len+fn_len, newext, ext_len); return(outname); } static void remap_floyd(int cols, int rows, unsigned char map[MAXNETSIZE][4], unsigned int* remap, uch **row_pointers, int quantization_method) { uch *outrow = NULL; /* Output image pixels */ int i,row; #define CLAMP(a) ((a)>=0 ? ((a)<=255 ? (a) : 255) : 0) /* Do each image row */ for ( row = 0; (ulg)row < rows; ++row ) { int offset, nextoffset; outrow = rwpng_info.interlaced? row_pointers[row] : rwpng_info.indexed_data; int rederr=0; int blueerr=0; int greenerr=0; int alphaerr=0; offset = row*cols*4; nextoffset = offset; if (row+1 0 ? i : cols-i-1] = remap[idx]; int alpha = MAX(map[idx][3],rwpng_info.rgba_data[offset+3]); int colorimp = 255 - ((255-alpha) * (255-alpha) / 255); int thisrederr=(map[idx][0] - rwpng_info.rgba_data[offset]) * colorimp / 255; int thisblueerr=(map[idx][1] - rwpng_info.rgba_data[offset+1]) * colorimp / 255; int thisgreenerr=(map[idx][2] - rwpng_info.rgba_data[offset+2]) * colorimp / 255; int thisalphaerr=map[idx][3] - rwpng_info.rgba_data[offset+3]; rederr += thisrederr; greenerr += thisblueerr; blueerr += thisgreenerr; alphaerr += thisalphaerr; unsigned int thiserr = (thisrederr*thisrederr + thisblueerr*thisblueerr + thisgreenerr*thisgreenerr + thisalphaerr*thisalphaerr)*2; floyderr = rederr*rederr + greenerr*greenerr + blueerr*blueerr + alphaerr*alphaerr; int L = 10; while (rederr*rederr > L*L || greenerr*greenerr > L*L || blueerr*blueerr > L*L || alphaerr*alphaerr > L*L || floyderr > thiserr || floyderr > L*L*2) { rederr /=2;greenerr /=2;blueerr /=2;alphaerr /=2; floyderr = rederr*rederr + greenerr*greenerr + blueerr*blueerr + alphaerr*alphaerr; } if (i>0) { rwpng_info.rgba_data[nextoffset-increment+3]=CLAMP(rwpng_info.rgba_data[nextoffset-increment+3] - alphaerr*3/16); rwpng_info.rgba_data[nextoffset-increment+2]=CLAMP(rwpng_info.rgba_data[nextoffset-increment+2] - blueerr*3/16 ); rwpng_info.rgba_data[nextoffset-increment+1]=CLAMP(rwpng_info.rgba_data[nextoffset-increment+1] - greenerr*3/16); rwpng_info.rgba_data[nextoffset-increment] =CLAMP(rwpng_info.rgba_data[nextoffset-increment] - rederr*3/16 ); } if (i+1 0) { quantization_gamma = force_gamma; file_gamma=0; } else if (png_get_gAMA(rwpng_info.png_ptr, rwpng_info.info_ptr, &file_gamma) && file_gamma > 0) { quantization_gamma = file_gamma; } else { quantization_gamma = 1.8; file_gamma = 0; } if (file_gamma > 0) { PNGNQ_MESSAGE("Using image gamma %e (1/%e)\n", file_gamma, 1.0/file_gamma); } else { PNGNQ_MESSAGE("Assuming gamma %1.4f (1/%1.1f)\n",quantization_gamma,1.0/quantization_gamma); } if (sample_factor<1) { sample_factor = 1 + rows*cols / (512*512); if (sample_factor > 10) sample_factor = 10; if (sample_factor > 1) { PNGNQ_MESSAGE("Sampling 1//%d of image\n", sample_factor); } } /* Start neuquant */ initnet((unsigned char*)rwpng_info.rgba_data,rows*cols*4,newcolors,quantization_gamma); learn(sample_factor,verbose); inxbuild(); getcolormap((unsigned char*)map); /* Remap indexes so all tRNS chunks are together */ PNGNQ_MESSAGE(" Remapping colormap to eliminate opaque tRNS-chunk entries...\n"); for (top_idx = newcolors-1, bot_idx = x = 0; x < newcolors; ++x) { if (map[x][3] == 255) /* maxval */ remap[x] = top_idx--; else remap[x] = bot_idx++; } PNGNQ_MESSAGE( "%d entr%s left\n", bot_idx,(bot_idx == 1)? "y" : "ies"); /* sanity check: top and bottom indices should have just crossed paths */ if (bot_idx != top_idx + 1) { PNGNQ_WARNING(" Internal logic error: remapped bot_idx = %d, top_idx = %d\n",bot_idx, top_idx); if (rwpng_info.row_pointers) free(rwpng_info.row_pointers); if (rwpng_info.rgba_data) free(rwpng_info.rgba_data); if (!using_stdin) fclose(outfile); return 18; } rwpng_info.sample_depth = 8; rwpng_info.num_palette = newcolors; rwpng_info.num_trans = bot_idx; /* GRR TO DO: if bot_idx == 0, check whether all RGB samples are gray and if so, whether grayscale sample_depth would be same => skip following palette section and go grayscale */ /* Remap and make palette entries */ for (x = 0; x < newcolors; ++x) { rwpng_info.palette[remap[x]].red = map[x][0]; rwpng_info.palette[remap[x]].green = map[x][1]; rwpng_info.palette[remap[x]].blue = map[x][2]; rwpng_info.trans[remap[x]] = map[x][3]; } /* Allocate memory*/ if (rwpng_info.interlaced) { if ((rwpng_info.indexed_data = (uch *)malloc(rows * cols)) != NULL) { if ((row_pointers = (uch **)malloc(rows * sizeof(uch *))) != NULL) for (row = 0; (ulg)row < rows; ++row) row_pointers[row] = rwpng_info.indexed_data + row*cols; } } else rwpng_info.indexed_data = (uch *)malloc(cols); if (rwpng_info.indexed_data == NULL || (rwpng_info.interlaced && row_pointers == NULL)) { PNGNQ_ERROR(" Insufficient memory for indexed data and/or row pointers\n"); if (rwpng_info.row_pointers) free(rwpng_info.row_pointers); if (rwpng_info.rgba_data) free(rwpng_info.rgba_data); if (rwpng_info.indexed_data) free(rwpng_info.indexed_data); if (!using_stdin) fclose(outfile); return 17; } /* Write headers and such. */ if (rwpng_write_image_init(outfile, &rwpng_info) != 0) { PNGNQ_ERROR(" rwpng_write_image_init() error\n" ); if (rwpng_info.rgba_data) free(rwpng_info.rgba_data); if (rwpng_info.row_pointers) free(rwpng_info.row_pointers); if (rwpng_info.indexed_data) free(rwpng_info.indexed_data); if (row_pointers) free(row_pointers); if (!using_stdin) fclose(outfile); return rwpng_info.retval; } if (quantization_method > 0) { remap_floyd(cols,rows,map,remap,row_pointers, quantization_method); } else { remap_simple(cols,rows,map,remap,row_pointers); } /* now we're done with the INPUT data and row_pointers, so free 'em */ if (rwpng_info.rgba_data) { free(rwpng_info.rgba_data); rwpng_info.rgba_data = NULL; } if (rwpng_info.row_pointers) { free(rwpng_info.row_pointers); rwpng_info.row_pointers = NULL; } /* write entire interlaced palette PNG, or finish/flush noninterlaced one */ if (rwpng_info.interlaced) { rwpng_info.row_pointers = row_pointers; /* now for OUTPUT data */ rwpng_write_image_whole(&rwpng_info); } else rwpng_write_image_finish(&rwpng_info); if (!using_stdin) fclose(outfile); /* now we're done with the OUTPUT data and row_pointers, too */ if (rwpng_info.indexed_data) { free(rwpng_info.indexed_data); rwpng_info.indexed_data = NULL; } if (row_pointers) { free(row_pointers); row_pointers = rwpng_info.row_pointers = NULL; } /* Clean up file name */ if(outname){ free(outname); outname = NULL; } return 0; } pngnq-1.0/src/neuquant32.c0000644000175000017500000003322711204770677012400 00000000000000/* NeuQuant Neural-Net Quantization Algorithm * ------------------------------------------ * * Copyright (c) 1994 Anthony Dekker * * NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994. * See "Kohonen neural networks for optimal colour quantization" * in "Network: Computation in Neural Systems" Vol. 5 (1994) pp 351-367. * for a discussion of the algorithm. * See also http://members.ozemail.com.au/~dekker/NEUQUANT.HTML * * Any party obtaining a copy of these files from the author, directly or * indirectly, is granted, free of charge, a full and unrestricted irrevocable, * world-wide, paid up, royalty-free, nonexclusive right and license to deal * in this software and documentation files (the "Software"), including without * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons who receive * copies from any such party to do so, with the only requirement being * that this copyright notice remain intact. * * * Modified to process 32bit RGBA images. * Stuart Coyle 2004-2006 * * Rewritten by Kornel Lesiński (2009) */ #include "neuquant32.h" #include /* Network Definitions ------------------- */ #define maxnetpos (MAXNETSIZE-1) #define ncycles 100 /* no. of learning cycles */ #define ABS(a) ((a)>=0?(a):-(a)) /* defs for freq and bias */ #define gammashift 10 /* gamma = 1024 */ #define gamma ((double)(1<>3) /* for 256 cols, radius starts */ #define initradius (initrad*1.0) /* and decreases by a */ #define radiusdec 30 /* factor of 1/30 each cycle */ /* defs for decreasing alpha factor */ #define alphabiasshift 10 /* alpha starts at 1.0 */ #define initalpha ((double)(1< 255) return 255; return temp; } static inline unsigned int round_biased(double temp) { if (temp < 0) return 0; temp = floor((temp / 255.0 * 256.0)); if (temp > 255) return 255; return temp; } inline static double biasvalue(unsigned int temp) { return biasvalues[temp]; } /* Output colormap to unsigned char ptr in RGBA format */ void getcolormap(unsigned char *map) { unsigned int j; for(j=0; j>1; for (j=previouscol+1; j>1; for (j=previouscol+1; j<256; j++) netindex[j] = maxnetpos; /* really 256 */ } inline static double colorimportance(double al) { double transparency = 1.0 - al/255.0; return (1.0 - transparency*transparency); } /* Search for ABGR values 0..255 (after net is unbiased) and return colour index ---------------------------------------------------------------------------- */ unsigned int slowinxsearch( int al, int b, int g, int r) { unsigned int i,best=0; double a,bestd=1<<30,dist; r=biasvalue(r); g=biasvalue(g); b=biasvalue(b); double colimp = colorimportance(al); for(i=0; i < netsize; i++) { a = colormap[i].r - r; dist = a*a * colimp; a = colormap[i].g - g; dist += a*a * colimp; a = colormap[i].b - b; dist += a*a * colimp; a = colormap[i].al - al; dist += a*a; if (dist=0)) { if (i bestd) break; /* stop iter */ else { a = colormap[i].r - r; dist += a*a * colimp; if (dist=0) { a = colormap[j].g - g; /* inx key - reverse dif */ dist = a*a * colimp; if (dist > bestd) break; /* stop iter */ else { a = colormap[j].b - b; dist += a*a * colimp; if (distnetsize-1) hi=netsize-1; j = i+1; k = i-1; q = radpower; while ((j<=hi) || (k>=lo)) { a = (*(++q)) / alpharadbias; if (j<=hi) { network[j].al -= a*(network[j].al - al); network[j].b -= a*(network[j].b - b) ; network[j].g -= a*(network[j].g - g) ; network[j].r -= a*(network[j].r - r) ; j++; } if (k>=lo) { network[k].al -= a*(network[k].al - al); network[k].b -= a*(network[k].b - b) ; network[k].g -= a*(network[k].g - g) ; network[k].r -= a*(network[k].r - r) ; k--; } } } /* Main Learning Loop ------------------ */ /* sampling factor 1..30 */ void learn(unsigned int samplefac, unsigned int verbose) /* Stu: N.B. added parameter so that main() could control verbosity. */ { unsigned int i,j,al,b,g,r; unsigned int rad,step,delta,samplepixels; double radius,alpha; unsigned char *p; unsigned char *lim; alphadec = 30 + ((samplefac-1)/3); p = thepicture; lim = thepicture + lengthcount; samplepixels = lengthcount/(4*samplefac); delta = samplepixels/ncycles; /* here's a problem with small images: samplepixels < ncycles => delta = 0 */ if(delta==0) delta = 1; /* kludge to fix */ alpha = initalpha; radius = initradius; rad = radius; if (rad <= 1) rad = 0; for (i=0; i= lim) p -= lengthcount; i++; if (i%delta == 0) { /* FPE here if delta=0*/ alpha -= alpha / (double)alphadec; radius -= radius / (double)radiusdec; rad = radius; if (rad <= 1) rad = 0; for (j=0; j #include #define MAXNETSIZE 256 /* maximum number of colours that can be used. actual number is now passed to initcolors */ /* four primes near 500 - assume no image has a length so large */ /* that it is divisible by all four primes */ #define prime1 499 #define prime2 491 #define prime3 487 #define prime4 503 #define minpicturebytes (4*prime4) /* minimum size for input image */ /* Initialise network in range (0,0,0,0) to (255,255,255,255) and set parameters ----------------------------------------------------------------------- */ void initnet(unsigned char *thepic, unsigned int len, unsigned int colours, double gamma); /* Unbias network to give byte values 0..255 and record position i to prepare for sort ----------------------------------------------------------------------------------- */ static inline double biasvalue(unsigned int temp); /* Output colour map ----------------- */ void getcolormap(unsigned char *map); /* Insertion sort of network and building of netindex[0..255] (to do after unbias) ------------------------------------------------------------------------------- */ void inxbuild(); /* Search for ABGR values 0..255 (after net is unbiased) and return colour index ---------------------------------------------------------------------------- */ unsigned int inxsearch( int al, int b, int g, int r); unsigned int slowinxsearch( int al, int b, int g, int r); /* Main Learning Loop ------------------ */ void learn(unsigned int samplefactor, unsigned int verbose); /* Program Skeleton ---------------- [select samplefac in range 1..30] pic = (unsigned char*) malloc(4*width*height); [read image from input file into pic] initnet(pic,4*width*height,samplefac,colors); learn(); unbiasnet(); [write output image header, using writecolourmap(f), possibly editing the loops in that function] inxbuild(); [write output image using inxsearch(a,b,g,r)] */ pngnq-1.0/src/rwpng.h0000644000175000017500000000653711204770677011541 00000000000000/*--------------------------------------------------------------------------- pngquant: RGBA -> RGBA-palette quantization program rwpng.h --------------------------------------------------------------------------- Copyright (c) 1998-2000 Greg Roelofs. All rights reserved. This software is provided "as is," without warranty of any kind, express or implied. In no event shall the author or contributors be held liable for any damages arising in any way from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. Redistributions of source code must retain the above copyright notice, disclaimer, and this list of conditions. 2. Redistributions in binary form must reproduce the above copyright notice, disclaimer, and this list of conditions in the documenta- tion and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgment: This product includes software developed by Greg Roelofs and contributors for the book, "PNG: The Definitive Guide," published by O'Reilly and Associates. ---------------------------------------------------------------------------*/ #ifndef TRUE # define TRUE 1 # define FALSE 0 #endif #ifndef MAX # define MAX(a,b) ((a) > (b)? (a) : (b)) # define MIN(a,b) ((a) < (b)? (a) : (b)) #endif #ifdef DEBUG # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);} #else # define Trace(x) ; #endif #define TEXT_TITLE 1 #define TEXT_AUTHOR 1 #define TEXT_DESC 1 #define TEXT_COPY 1 #define TEXT_EMAIL 1 #define TEXT_URL 1 typedef unsigned char uch; typedef unsigned short ush; typedef unsigned long ulg; typedef struct _rwpng_color_struct { png_byte red; png_byte green; png_byte blue; } rwpng_color; typedef struct _mainprog_info { double gamma; ulg width; /* read/write */ ulg height; /* read/write */ ulg rowbytes; /* read */ void *png_ptr; /* read/write */ void *info_ptr; /* read/write */ rwpng_color palette[256]; /* write */ uch trans[256]; /* write */ uch *rgba_data; /* read */ uch *indexed_data; /* write */ uch **row_pointers; /* read/write */ jmp_buf jmpbuf; /* read/write */ int interlaced; /* read/write */ int channels; /* read (currently not used) */ int sample_depth; /* write */ int num_palette; /* write */ int num_trans; /* write */ int retval; /* read/write */ int have_bg; uch bg_red; uch bg_green; uch bg_blue; int have_time; time_t modtime; int have_text; char *title; char *author; char *copyright; char *desc; char *email; char *url; } mainprog_info; /* prototypes for public functions in rwpng.c */ void rwpng_version_info(void); int rwpng_read_image(FILE *infile, mainprog_info *mainprog_ptr); int rwpng_write_image_init(FILE *outfile, mainprog_info *mainprog_ptr); int rwpng_write_image_whole(mainprog_info *mainprog_ptr); int rwpng_write_image_row(mainprog_info *mainprog_ptr); int rwpng_write_image_finish(mainprog_info *mainprog_ptr); pngnq-1.0/src/errors.h0000644000175000017500000000147711204770677011716 00000000000000/* error.h * Error handling for pngnq */ #include "syslog.h" /* Error codes */ #define PNGNQ_ERR_NONE 0 #define PNGNQ_ERR_ 0 #define PNGNQ_LOG_ERR(...)(syslog(LOG_ERR,\ "pngnq - Error in %s near line %d:",__FILE__,__LINE__));\ syslog(LOG_ERR, __VA_ARGS__); #define PNGNQ_LOG_WARNING(...)(syslog(LOG_WARNING,"pngnq - warning: "));\ syslog(LOG_WARNING, __VA_ARGS__); #define PNGNQ_ERROR(...) (fprintf(stderr,\ "pngnq - Error in %s near line %d :\n",__FILE__,__LINE__));\ fprintf(stderr, __VA_ARGS__);\ PNGNQ_LOG_ERR(__VA_ARGS__)\ fflush(stderr); #define PNGNQ_WARNING(...) (fprintf(stderr,"pngnq - Warning: "));\ fprintf(stderr, __VA_ARGS__);\ PNGNQ_LOG_WARNING(__VA_ARGS__)\ fflush(stderr); #define PNGNQ_MESSAGE(...) {if(verbose) {fprintf(stderr,__VA_ARGS__);fflush(stderr);}}