5 Commits

Author	SHA1	Message	Date
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
kris	2458bf98f7	Pack output in Apple II screen format and save as binary file.	2020-12-30 10:27:33 +00:00
kris	38d621a097	Fix edge conditions in dithering ... Add TODOs	2020-12-29 21:03:17 +00:00
kris	da420b66c8	Limit colour choices to the two available at each pixel.	2020-12-29 20:47:33 +00:00
kris	5a6eb08db1	Floyd-Steinberg dithering to DHGR colour palette. Doesn't yet take ... into account the restrictions on neighbouring colours.	2020-12-29 18:24:29 +00:00