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Lossy compression of PNG images

Home Page: https://frammish.org/pngloss/

License: Other

C 30.07% Makefile 20.58% Shell 40.14% Roff 1.06% HTML 1.52% Go 5.77% CSS 0.79% M4 0.06%

png lossy-compression image-optimization png-compression image-compression c

pngloss's People

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imageprocessing-electronicpublications bits-quant patmosxx-v2 hanskeksnascher shamork

pngloss's Issues

options->strength?

Hi @foobaz .

Maybe you should use an adaptive model?:

quantization_strength_local = abs(current_pixel - mean(current_pixel + 3x3)) * options->strength / 10

Separate code and docs?

Maybe?:

mkdir src
mv *.c *.h src

pngloss/Makefile

Line 13 in 2a67d09

 OBJS = color_delta.o optimize_state.o pngloss_image.o pngloss_opts.o pngloss.o rwpng.o 

OBJS = src/color_src/delta.o src/optimize_state.o src/pngloss_image.o src/pngloss_opts.o src/pngloss.o src/rwpng.o

Comparison with XPNG?

Maybe add a comparison with XPNG to the documentation?

Origin:

pngloss -s 40 -- lena.png

xpng lena.png lena.xpng20.png 20

Two-stage error diffusion?

Maybe (small optimize)?:

https://github.com/ImageProcessing-ElectronicPublications/pngloss/blob/f352ce0a00abac75848d643ee09a6d628f597e32/src/optimize_state.c#L398
https://github.com/ImageProcessing-ElectronicPublications/pngloss/blob/f352ce0a00abac75848d643ee09a6d628f597e32/src/optimize_state.c#L446

to:

        int_fast16_t d = difference[c], dbak = 0;
...
        d += dbak;
        dbak = d / 4;
        d -= dbak;
        int_fast16_t twos = d / 16;

Windows binary

Dear William,
Could you be so kind to generate .exe for the rest of us who are mere Windows users w/o compiler?

Build error

./configure runs fine, but make gives:

Making all in src                                                                                                              [80/7859]
make[1]: Entering directory '/data/git/pngloss/src'                                                                                     
gcc -DPACKAGE_NAME=\"pngloss\" -DPACKAGE_TARNAME=\"pngloss\" -DPACKAGE_VERSION=\"1.0.1\" -DPACKAGE_STRING=\"pngloss\ 1.0.1\" -DPACKAGE_B
UGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"pngloss\" -DVERSION=\"1.0.1\" -I.    -I/usr/include/libpng16 -g -O2 -MT pngloss-color_delta
.o -MD -MP -MF .deps/pngloss-color_delta.Tpo -c -o pngloss-color_delta.o `test -f 'color_delta.c' || echo './'`color_delta.c            
mv -f .deps/pngloss-color_delta.Tpo .deps/pngloss-color_delta.Po                                                                        
gcc -DPACKAGE_NAME=\"pngloss\" -DPACKAGE_TARNAME=\"pngloss\" -DPACKAGE_VERSION=\"1.0.1\" -DPACKAGE_STRING=\"pngloss\ 1.0.1\" -DPACKAGE_B
UGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"pngloss\" -DVERSION=\"1.0.1\" -I.    -I/usr/include/libpng16 -g -O2 -MT pngloss-optimize_st
ate.o -MD -MP -MF .deps/pngloss-optimize_state.Tpo -c -o pngloss-optimize_state.o `test -f 'optimize_state.c' || echo './'`optimize_stat
e.c                                                                                                                                     
mv -f .deps/pngloss-optimize_state.Tpo .deps/pngloss-optimize_state.Po                                                                  
gcc -DPACKAGE_NAME=\"pngloss\" -DPACKAGE_TARNAME=\"pngloss\" -DPACKAGE_VERSION=\"1.0.1\" -DPACKAGE_STRING=\"pngloss\ 1.0.1\" -DPACKAGE_B
UGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"pngloss\" -DVERSION=\"1.0.1\" -I.    -I/usr/include/libpng16 -g -O2 -MT pngloss-pngloss_ima
ge.o -MD -MP -MF .deps/pngloss-pngloss_image.Tpo -c -o pngloss-pngloss_image.o `test -f 'pngloss_image.c' || echo './'`pngloss_image.c  
mv -f .deps/pngloss-pngloss_image.Tpo .deps/pngloss-pngloss_image.Po                                                                    
gcc -DPACKAGE_NAME=\"pngloss\" -DPACKAGE_TARNAME=\"pngloss\" -DPACKAGE_VERSION=\"1.0.1\" -DPACKAGE_STRING=\"pngloss\ 1.0.1\" -DPACKAGE_B
UGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"pngloss\" -DVERSION=\"1.0.1\" -I.    -I/usr/include/libpng16 -g -O2 -MT pngloss-pngloss_opt
s.o -MD -MP -MF .deps/pngloss-pngloss_opts.Tpo -c -o pngloss-pngloss_opts.o `test -f 'pngloss_opts.c' || echo './'`pngloss_opts.c
mv -f .deps/pngloss-pngloss_opts.Tpo .deps/pngloss-pngloss_opts.Po
gcc -DPACKAGE_NAME=\"pngloss\" -DPACKAGE_TARNAME=\"pngloss\" -DPACKAGE_VERSION=\"1.0.1\" -DPACKAGE_STRING=\"pngloss\ 1.0.1\" -DPACKAGE_B
UGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"pngloss\" -DVERSION=\"1.0.1\" -I.    -I/usr/include/libpng16 -g -O2 -MT pngloss-pngloss.o -
MD -MP -MF .deps/pngloss-pngloss.Tpo -c -o pngloss-pngloss.o `test -f 'pngloss.c' || echo './'`pngloss.c
mv -f .deps/pngloss-pngloss.Tpo .deps/pngloss-pngloss.Po
gcc -DPACKAGE_NAME=\"pngloss\" -DPACKAGE_TARNAME=\"pngloss\" -DPACKAGE_VERSION=\"1.0.1\" -DPACKAGE_STRING=\"pngloss\ 1.0.1\" -DPACKAGE_B
UGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"pngloss\" -DVERSION=\"1.0.1\" -I.    -I/usr/include/libpng16 -g -O2 -MT pngloss-rwpng.o -MD
 -MP -MF .deps/pngloss-rwpng.Tpo -c -o pngloss-rwpng.o `test -f 'rwpng.c' || echo './'`rwpng.c
mv -f .deps/pngloss-rwpng.Tpo .deps/pngloss-rwpng.Po
gcc -I/usr/include/libpng16 -g -O2 -lpng16 -lz  -o pngloss pngloss-color_delta.o pngloss-optimize_state.o pngloss-pngloss_image.o pnglos
s-pngloss_opts.o pngloss-pngloss.o pngloss-rwpng.o  
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_read_image24_libpng':
/home/pp/git/pngloss/src/rwpng.c:186: undefined reference to `png_create_read_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:192: undefined reference to `png_create_info_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:207: undefined reference to `png_set_option'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:221: undefined reference to `png_set_read_fn'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:223: undefined reference to `png_read_info'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:229: undefined reference to `png_get_IHDR'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:255: undefined reference to `png_set_gray_to_rgb'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:260: undefined reference to `png_get_valid'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:277: undefined reference to `png_set_interlace_handling'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:282: undefined reference to `png_read_update_info'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:284: undefined reference to `png_get_rowbytes'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_create_row_pointers':
/home/pp/git/pngloss/src/rwpng.c:117: undefined reference to `png_get_rowbytes'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_read_image24_libpng':
/home/pp/git/pngloss/src/rwpng.c:302: undefined reference to `png_read_image'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:307: undefined reference to `png_read_end'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:394: undefined reference to `png_destroy_read_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:202: undefined reference to `png_destroy_read_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:294: undefined reference to `png_destroy_read_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:213: undefined reference to `png_set_keep_unknown_chunks'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:217: undefined reference to `png_set_read_user_chunk_fn'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:264: undefined reference to `png_get_gAMA'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:240: undefined reference to `png_set_expand'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:241: undefined reference to `png_set_filler'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:251: undefined reference to `png_set_strip_16'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:194: undefined reference to `png_destroy_read_struct'
/usr/bin/ld: pngloss-rwpng.o: in function `user_read_data':
/home/pp/git/pngloss/src/rwpng.c:75: undefined reference to `png_get_io_ptr'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:79: undefined reference to `png_error'
/usr/bin/ld: pngloss-rwpng.o: in function `read_chunk_callback':
/home/pp/git/pngloss/src/rwpng.c:141: undefined reference to `png_get_user_chunk_ptr'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_error_handler':
/home/pp/git/pngloss/src/rwpng.c:655: undefined reference to `png_get_error_ptr'
/usr/bin/ld: pngloss-rwpng.o: in function `user_write_data':
/home/pp/git/pngloss/src/rwpng.c:94: undefined reference to `png_get_io_ptr'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_write_image_init':                                                                     
/home/pp/git/pngloss/src/rwpng.c:449: undefined reference to `png_create_write_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:455: undefined reference to `png_create_info_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:471: undefined reference to `png_set_compression_level'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:472: undefined reference to `png_set_compression_mem_level'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:467: undefined reference to `png_destroy_write_struct'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:457: undefined reference to `png_destroy_write_struct'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_version_info':
/home/pp/git/pngloss/src/rwpng.c:43: undefined reference to `png_get_header_ver'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_write_image24':
/home/pp/git/pngloss/src/rwpng.c:524: undefined reference to `png_init_io'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:532: undefined reference to `png_set_write_fn'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:546: undefined reference to `png_set_unknown_chunks'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:610: undefined reference to `png_set_IHDR'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:610: undefined reference to `png_set_IHDR'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_write_end':
/home/pp/git/pngloss/src/rwpng.c:481: undefined reference to `png_write_info'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:486: undefined reference to `png_set_packing'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:488: undefined reference to `png_set_filter'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:490: undefined reference to `png_write_row'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:493: undefined reference to `png_set_filter'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:494: undefined reference to `png_write_row'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:500: undefined reference to `png_write_end'
/usr/bin/ld: /home/pp/git/pngloss/src/rwpng.c:502: undefined reference to `png_destroy_write_struct'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_set_gamma':
/home/pp/git/pngloss/src/rwpng.c:508: undefined reference to `png_set_gAMA'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_write_end':
/home/pp/git/pngloss/src/rwpng.c:484: undefined reference to `png_set_filler'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_create_row_pointers':
/home/pp/git/pngloss/src/rwpng.c:117: undefined reference to `png_get_rowbytes'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_write_end':
/home/pp/git/pngloss/src/rwpng.c:497: undefined reference to `png_write_image'
/usr/bin/ld: pngloss-rwpng.o: in function `rwpng_set_gamma':
/home/pp/git/pngloss/src/rwpng.c:511: undefined reference to `png_set_sRGB'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:346: pngloss] Error 1
make[1]: Leaving directory '/data/git/pngloss/src'
make: *** [Makefile:410: all-recursive] Error 1

Use NLM for dither?

Maybe?:

dc[i] = color_distance(current, current+i)
dcs = sum(dc)
if (dcs > 0) {dc[i] /= dcs} else {dc[i] = 1.0/n}
ec[i] = error * dc[i]

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