Le 02/04/2025 à 23:13, Michael Niedermayer a écrit :
[...]
This improves compression as wrap around can be cheaper to reach a
value.
There is an issue in FFV1 version <=3 with RCT, bit depth of resulting
luminance plane was 1 more than needed (RCT adds 1 bit to chrominance
but not to luminance, but with current spec all planes have 1 additional
bit), preventing in practice the wrap around for luminance, do I
understand well that the remap would mitigate such issue?
I wonder if with remap it would still be interesting to have a specific
code for having luminance without this additional useless bit, or if we
just go with the remap.
Maybe it needs tests (performance impact of remap when not really useful
vs just keeping the right bit depth of luminance? would remap be faster
if we keep the right bit depth of luminance?).
Jérôme
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