ii-pix

mirror of https://github.com/KrisKennaway/ii-pix.git synced 2024-06-01 06:41:29 +00:00

Convert images to Apple II Double Hi-Res format

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kris ff7a7365bb - Convert from sRGB to linear RGB when rescaling image, and when 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)	2021-01-03 22:32:04 +00:00
dither.py	- Convert from sRGB to linear RGB when rescaling image, and when	2021-01-03 22:32:04 +00:00

kris ff7a7365bb - Convert from sRGB to linear RGB when rescaling image, and when

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)

2021-01-03 22:32:04 +00:00

dither.py

- Convert from sRGB to linear RGB when rescaling image, and when

2021-01-03 22:32:04 +00:00