Dithering Beauty

As a start, I’d like to talk a bit about dithering.
When I found out that Urban Runner’s VMD use the Indeo 3 codec for video frame data, I was a bit crushed: The resulting frames are in true color (in the YUV colorspace) and ScummVM doesn’t (yet?) support a true color mode for game graphics — only paletted 8-bit colors.

So at first, to test the Indeo 3 decoder (copied from the great FFmpeg project), I just wrote the frame to files. The results looked, after fiddling a bit, like that: Continue reading