Quote:
Originally Posted by Quoth
It is less sharp and has colour artefacts if you send 300 dpi data to a Kaledio screen. The coloured dots partially occluding each mono pixel are always there. It's delusional and dishonest marketing to claim it's a full 300 dpi like a mono panel.
It's physics. I have seen two models of Kaledio3. No way is it as good as any model 300 dpi mono eink. Even the PW4 is better.
It's certainly a lot better than a CFA that entirely covers the mono pixels, at the expense of making it pastel colours, but please stop claiming it's a real 300 dpi. It's not and Kaledio eink is darker, less sharp and potential for coloured lines with 300 dpi mono content than the same mono panels without the printed CFA.
The only way to never have colour artefacts on mono content is to treat it as 150 dpi.
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How long did you see the two models for? Did you actually do something simple like test the same sentence in color vs. B&W on the same page on the same screen? It's really obvious if you do that.
It is real 300 DPI. The B&W parts contain just as many cells that are dark/light as the non-Kaleido versions. Yes, it's darker and less sharp because of the color layer but EVERY layer cuts sharpness and contrast. A 300 DPI screen with a Wacom digitizer, glass layer will be less sharp and darker than the same panel without those things. That doesn't make a model with a digitizer and glass layer not 300 DPI, it's still the same numbers of dots per inch even if it's a little fuzzier. Same thing with Kaleido 3. But even with the color layer, with my near sighted eyesight it's still noticeably sharper than 200 DPI and not that much worse than a 300 DPI device with a Wacom digitizer and glass layer. The Kindle PW4 (2018?) is a 300 DPI device with very few layers so yeah, understandably it looks better. But unless you're directly comparing you'll barely notice.
Kobo has a "Reduce rainbow effect", not a rainbow removal feature. It doesn't seem to cut the resolution in half but maybe lightly blur things. It doesn't completely eliminate rainbow effect in all instances and IMO is not worth using. Rainbow effect really only impacts images with very very small gaps like the screentone used by some comic book authors, although even there it's rare because it has to be so fine. For text, especially text with latin characters it's not a problem at realistically readable sizes, maybe for very complex CJK characters like 𰻞 it might be, but those are rare as well.