Thread: new Kobo model?
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Old 04-29-2020, 12:51 PM   #58
Quoth
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Quote:
Originally Posted by DNSB View Post
colour segments would render at 100DPI while black and white text would render at 300DPI.
As soon as you add a colour filter, the visible monochrome resolution is the SAME as the colour resolution. 100 x 300 dpi at best.
Except with pure black and white (no greys) like text you can use subpixel addressing to pretend you still have 300 dpi horizontally by colouring the edges of the pixels.
https://en.wikipedia.org/wiki/ClearT...learType_works
Mac, Linux etc use the same scheme.
It does produce a visual effect similar to not having the colour filter because our colour vision is not as good at detail as contrasty monochrome. It's still not quite as good as a 300 x 300 dpi mono screen.

Unless you have an ACTIVE colour layer that can be switched to transparent, then the resulting effective monochrome resolution is perfectly equal to the colour resolution as adjacent R, G and B simulate by visual addition of the light to get the greys and white. I've never heard of any such active colour layer and if it existed, then three layers with Cyan, Yellow and Magenta would be nearly 3 times brighter and would not reduce the physical resolution.
Mention of 100 dpi means they are using side by side Red, Green and Blue filter dots, so the simplest brightest scheme is stripes, thus 100 x 300 dpi.
An alternate is the 150 dpi from 300 in BOTH directions by using a square of pixels, RG and GB. That's poorer for any cleartype scheme though can do brighter greens.
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