This looks really interesting but I will have to read up on what it does before I can even begin to test it.
On Sun, Nov 12, 2023 at 9:57 AM Andrew Randrianasulu < [email protected]> wrote: > using code example from > > > https://git.ffmpeg.org/gitweb/ffmpeg.git/blobdiff/f7bab37c8e66f3c77a5fbb5b5b72c10b0fb4ca5a..6f79f0971e8ccf6c7a2b8eb1dbc5b64fdd77ca0f:/libavcodec/pngenc.c > > and test files from > > https://littlecms.com/img/blog/check_lut.jpg > > https://littlecms.com/img/blog/check_full.jpg > > I think I was able to make png ffmpeg encoder to add built-in profile, > based on (randomly-choose) colorimetry. > > patch itself needed to be applied with usual patch from directory just > above main cinelerra-5.1 level, and not "git am" > > tar.gz not included due to 7Mb size! > > Fake colorimetry I used: > > ======== > > # this codec creates a set of image files in a directory > # use an image2 file name like /dir/p%05d.png > flags2=0x80000000 > colorspace=smpte2085 > color_primaries=bt2020 > color_trc=bt2020_12bit > color_range=jpeg > > > ==== > > resulted in this exiftool output: > > exiftool /dev/shm/4.png > ExifTool Version Number : 11.11 > File Name : 4.png > Directory : /dev/shm > File Size : 29 kB > File Modification Date/Time : 2023:11:12 19:28:40+03:00 > File Access Date/Time : 2023:11:12 19:28:40+03:00 > File Inode Change Date/Time : 2023:11:12 19:28:40+03:00 > File Permissions : rw-r--r-- > File Type : PNG > File Type Extension : png > MIME Type : image/png > Image Width : 400 > Image Height : 300 > Bit Depth : 8 > Color Type : RGB > Compression : Deflate/Inflate > Filter : Adaptive > Interlace : Noninterlaced > Pixels Per Unit X : 1 > Pixels Per Unit Y : 1 > Pixel Units : Unknown > Profile Name : icc > Profile CMM Type : Little CMS > Profile Version : 4.3.0 > Profile Class : Display Device Profile > Color Space Data : RGB > Profile Connection Space : XYZ > Profile Date Time : 2023:11:12 16:28:40 > Profile File Signature : acsp > Primary Platform : Apple Computer Inc. > CMM Flags : Not Embedded, Independent > Device Manufacturer : > Device Model : > Device Attributes : Reflective, Glossy, Positive, Color > Rendering Intent : Perceptual > Connection Space Illuminant : 0.9642 1 0.82491 > Profile Creator : Little CMS > Profile ID : 0 > Profile Description : RGB built-in > Profile Copyright : No copyright, use freely > Media White Point : 0.9642 1 0.82491 > Chromatic Adaptation : 1.04788 0.02292 -0.05022 0.02959 > 0.99048 -0.01707 -0.00925 0.01508 0.75168 > Red Matrix Column : 0.67348 0.27904 -0.00194 > Blue Matrix Column : 0.12505 0.04561 0.79684 > Green Matrix Column : 0.16566 0.67534 0.02998 > Red Tone Reproduction Curve : (Binary data 32 bytes, use -b option > to extract) > Green Tone Reproduction Curve : (Binary data 32 bytes, use -b option > to extract) > Blue Tone Reproduction Curve : (Binary data 32 bytes, use -b option > to extract) > Chromaticity Channels : 3 > Chromaticity Colorant : Unknown (0) > Chromaticity Channel 1 : 0.70799 0.29201 > Chromaticity Channel 2 : 0.17 0.797 > Chromaticity Channel 3 : 0.131 0.04601 > Image Size : 400x300 > Megapixels : 0.120 > > > Note, of course this is WRONG kind of wrong, randomly setting > colorimetry tags on encode, but at least it hopefully show that > ffmpeg's machinery (6.1) works at least that far. > > sadly, no of those two test images show correct text, so I guess > display icc profile support quite missing step for us ...! > > but one micro/nanostep at a time? >
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