#9520: Invalid pal8 -> gbrp conversion
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Reporter: Robin | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: ffmpeg
Version: 4.4.1 | Resolution:
Keywords: pal8, gbrp, | Blocked By:
pix_fmt |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Robin):
Looks like it maybe related to #1286 which doesn't give me much hope this
will ever be fixed since has been opened for a decade.
However that ticket is reporting color conversion errors TO pal8. This
ticket is showing conversions errors are occurring FROM pal8 TO specific
formats.
produces errors: pal8 -> gbrp
correct: pal8 -> bgr0
correct: pal8 -> bgr0 -> gbrp
correct: pal8 -> pal8
#1286:
produces errors: rgb24 -> pal8
correct: pal8 -> pal8
On a sidenote, it appears Irfanview also gives incorrect results
converting to pal8. However, both ffmpeg and irfanview give different
results when converting to pal8.
I confirmed by taking a bgr24 BMP and performing a down conversion to pal8
and then back to bgr24. The resulting pal8 BMPs were different from each
other and the following bgr24 were also different, both from each other
and from the reference bgr24 BMP.
Both Irfanview and ffmpeg give the same results up converting pal8 BMPs to
bgr24 BMPs.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9520#comment:2>
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