[FFmpeg-devel] [PATCH v2 1/2] lavc/texturedsp: fix premult2straight inversion

[Connor Worley]

Linked are some demo files.

I converted a sample to DDS with texconv.exe -f DXT4 -pmalpha sample.png
I converted it back to PNG against master with ffmpeg -i sample.dds
master.png
I converted it back to PNG against this patch with ffmpeg -i sample.dds
patch.png

The color in master.png is dark due to being premultiplied twice.
The color in patch.png is true to sample.png.

https://connorworley.com/sample.png
https://connorworley.com/sample.dds
https://connorworley.com/master.png
https://connorworley.com/patch.png

-- 
Connor Worley