Quote:
Originally Posted by buffaloseven
Well...kind of. From what I've seen is that you still have your 300 DPI eInk below, and you do have the dot, but it doesn't look to me (from online images) that the degradation of BW is all the way down to 150, though it's definitely not 300.
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Exactly, it's somewhere in between, and some mono content at 300 dpi will have coloured artefacts, so the "rainbow" setting might treat mono as 150 dpi, which removes artefacts.
A 1920 x 1080 basic HD LCD is still "mono" below and is 5760 x 1080, or 1920 x 3240, or 3840 x 2160 depending on if it has 1/3rd width pixels, 1/3rd height pixels (both stripe CFA) or square pixels (like eink) with a 2 x 2 CFA. There are also more complex LCD and OLED. But the CFA completely covers the LCD pixels and no-one tries to market LCD, OLED, QLED, LED, Plasma or CRT at the real subpixel resolution, though Cleartype and similar can get extra text sharpness by using R G B sub-pixels (one edge uses red and the other uses blue) but only on stripe filters (like Triton, but Triton is far too dark and eink didn't have rectangular pixels).
I'm glad you realise that for mono text the colour eink can't equal current mono eink quality.
There also seems to be a noticeable "screen door" effect visible depending on eyesight and glasses with Kaleido 3. Some poorer LCD panels have it.
https://en.wikipedia.org/wiki/Screen-door_effect
Subpixel RGB (There is different kind of sub pixel add
ressing)
https://en.wikipedia.org/wiki/Subpixel_rendering
The Kaleido can't use subpixels the same way as on LCD / OLED / Plasma. CRTs can't use it because the controller doesn't know where they are.
So Kaleido only partially covers each pixel with ink in the Bayer related 2 x 2 pattern so that ignoring the colour pixel addressing of 150 dpi gives a degraded 300 dpi with coloured artefacts.
Also 2 x 2 colour addressing needs a more complex controller. Most colour panels use stripe filters and slightly smaller than 1/3 rd width (or height) pixels per visual pixel, because then it can be driven as three mono panels, each r, g or b. The more complex pixel layouts (mostly perfectly square, circular or hexagonal rather than rectangles) need custom controllers to map the colours to pixels. I suspect the reason Kaleido was years later than Triton or even ACeP was the adapting of the design of the controllers for non-stripe Bayer style 2 x 2 layouts. In pseudo 300 dpi mono mode it's just driven like a 300 dpi mono ink and in "anti-rainbow" mode driven like a 150 dpi panel, but the controller paralleling the 2 x 2 (=four pixels) layout.