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Originally Posted by compurandom
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Dithering the image to a resolution different than the device resolution doesn't really make a lot of sense, and will cause moire banding and doing it at a resolution different than the device resolution is basically wrong and worse than doing nothing.
My assumption is that the original kobo was only black and white, with no grey scale. You can simulate grey scale with dithering.
Also, I assume that pre-dithering the image for a screen that already supports grey scale is probably obsolete. A screen with 4 bit depth (16 shades of grey) is not bad and dithering to black and white will probably make it look worse, although it would be possible to dither 8 bit to 4 bit rather than 8 bit to 1 bit and have it look ok.
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I agree, I can't see the point of pre-dithering for Kobo as it's black, white and 14 greys and you have to get the resolution / scale exactly right.
There were early Sony & Kindle eink with only 2 bit levels. I'm sure that was before Kobo did any eink and all mono Kobo are 4 bit levels. All Pearl screens and all later Carta are all 4 bit. Later Vizplex (the one before Pearl) are 4 bit.
Hercules graphics or CGA mono was only 1 bit.
Most of the Sony Data Diskman were 1 bit LCD.