[FFmpeg-trac] #9085(avcodec:reopened): JPEG: YCCK too green
FFmpeg
trac at avcodec.org
Sun Mar 21 06:56:34 EET 2021
#9085: JPEG: YCCK too green
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Reporter: Balling | Owner:
Type: defect | Status: reopened
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: mjpeg cmyk | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by pdr0):
Replying to [comment:4 Balling]:
> I tested in Photoshop 2021: no alternative icc profile produces such
insane colours and removing colour management at all also does not produce
the colours as in ffmpeg. So it is not ICC.
Actually this is completely explained by ICC
You can strip the profile in imagemagick or similar, and you get same
results as non color managed, or ffmpeg (too green) , or any other non
color managed tool
eg.
convert.exe Channel_digital_image_CMYK_color.jpg -strip strip.png
Or you can convert cmyk to srgb and you get same as reference on any sRGB
display. (USWebCoatedSWOP.icc is the profile most often used for cmyk)
eg.
convert.exe Channel_digital_image_CMYK_color.jpg -profile
"USWebCoatedSWOP.icc" -profile "sRGB2014.icc" cmyk_to_srgb.png
You can read png tags with tweakpng, jpeg tags with jpegsnoop, or
imagemagick identify, or exiftool
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Ticket URL: <https://trac.ffmpeg.org/ticket/9085#comment:14>
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