[FFmpeg-devel] avfilter/vf_premultiply : use full range for RGB input

[Martin Vignali]

Hello,

Patch in attach change premultiply/unpremultiply filter for RGB input
to process it at full range

Avoid very strange result in unpremultiply mode

To test :
./ffmpeg -i ./fate-suite/mov/mov_alpha_premult.mov -vf
unpremultiply=inplace=1 resStraight.png -y

./ffmpeg -i ./fate-suite/mov/mov_alpha_premult.mov -vf
format=gbrap16,unpremultiply=inplace=1 resStraight16.png -y

Martin
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