Quote:
Originally Posted by ottischwenk
This is correct for black and white - but incorrect for black/something; Black is always 300 ppi and as long as you think you recognize the "something" as white, it doesn't matter to the viewer
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True, e-ink isn't Bayer array at all. Kaleido screens are basically two individual screens in one. Just like Foveon screens mentioned in that wikipedia article. They are stacked.
First layer is 300p layer at the bottom, then over it, it's lower resolution transparent rgb layer. When colour isn't utilised that makes screen 300p, albeit white tones will be of more grayish look, as coloured filter can not be completely invisible, even when not in use.
Looking at this screen from mydeepguide's review of boox nova 3 color, it's plainly seen how this works. Coloured pixels are much larger, but are transparent. White spot pixels of bw array can still be seen under them. The same should go for black pixels as well, but they are not plainly visible in this sample. This possibly means that coloured filter has a very small, practically invisible effect on black content. It could also be that they're not seen from image quality uploaded.
It's a complex tech, and little is known how it actually works. I'm almost leaning towards it right now so I could just see how it functions in practice. How does the device decide whether to utilise 300p or lower resolution? Vectored fonts in pdf could go high resolution, but what if pdf text isn't rasterized, and includes coloured content, but is still in 300p resolution or higher. Would that downscale everything and display text at coloured resolution?