#9673: ffmpeg not reading color information from JPEG ICC profile
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Reporter: Cosmin | Owner: haasn
Stejerean |
Type: defect | Status: open
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Balling):
Yes, Apple profile is quite buggy, it has not perfect chromatic adaption
matrix and it has negative red Z, which is prohibited and caused all kinds
of problem not on MacOS in our chromium and firefox, though is correctly
done by Little CMS stealing it from Adobe CMS/Apple. It is not like with
V-gamut though in mpv code, that has "wrong" negative values even
natively, while red Z negative in Display P3 comes from slightly wrong
chromatic adapation done by Apple.
Even sRGB para curve can be made slightly better if only you will round
correctly. See repo Compact-ICC-Profiles.
See my comments here: https://github.com/saucecontrol/Compact-ICC-
Profiles/issues/7#issuecomment-943567373
Here:
And here:
Still you need to understand THAT MEDIA WHITE POINT IS NOT the white point
of PROFILE CONNECTION SPACE, though apple did a mistake there as well. PCS
is ONLY D50, nothing else is supported untill v5. So you can just ignore
it.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9673#comment:6>
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