dithering. This is important for linear treatment of quantization
errors.
- Implement Jarvis dithering
- Implement CIE2000 perceptual diff for colour matching, and the
CIR601 luminosity weighting used by bmp2dhr (which might come from
https://bisqwit.iki.fi/story/howto/dither/jy/ - I can't find any
other source references for this yet). The former seems to give
much better results, although it is also several times slower.
- Switch back to treating the display as 140x192x16 colours,
i.e. ignoring NTSC colour fringing.
- Add sRGB palettes for Virtual II and OpenEmulator (based on sampling
screen display when rendering full-screen colour)