Quote:
Originally Posted by Renate
Well, until they fix that I refuse to read Fifty Shades of Grey!
* I probably will never read it anyway.
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Here is a nice intro to dithering.
https://tannerhelland.com/2012/12/28...urce-code.html
Note that the fast Bayer method (at the end) may look nearly as good as the best (and more compute intensive) error diffusion schemes if the dpi is high enough. So a 150 dpi colour image can look very good on a 1200 dpi printer that can only add yellow, cyan, magenta and black dots. Printers use CYMK rather than R G B for two reasons: 1) decent saturated RGB dots are about 1/5th brightness of yellow on paper. 2) CYMK is additive (e.g. Cyan is overprinted with Yellow for green) so gives better resolution than RGB which needs adjacent dots.
With eink, at least there is more than just black and white dots. However at 1200 dpi the faster refresh mode that doesn't do greys could be used for text and some grey scale images with less dithering than at 150 dpi (Kindle DX) to 300 dpi (most ereaders now).