Clara HD Sharpness Kobo

[RobertJSawyer]

I find the biggest source of ghosting is the display of book covers. If you have a protective cover on your Kobo, you really don't get to see the book cover on the E Ink screen anyway, so turning off (on the Power Saving menu, I think) the display of the current read's cover makes for cleaner screens without the cover's ghost after reopening the Kobo's protective cover.

[NiLuJe]

Again, that's because Kobo's doing it wrong.

Flash to white, flash to cover -> no ghosting.

Instead, Kobo's flashing the cover twice :/.

[RobertJSawyer]

I politely disagree, @NiJuJe. On many Kobo models (the Kobo Aura HD, for one) ghosting persists in successively smaller amounts for several refreshes. A sinlge "flash to white" will not undo the ghosting.

That said, I agree Kobo could do a much better job of knowing when to refresh the screen.

[NiLuJe]

@RobertJSawyer: Results are indeed going to be better on newer models (i.e., Mk. 7). I never said otherwise .

(Likewise, an old Kindle is also going to be worse. My old PW2 might have looked better than my H2O, but it still looks like crap compared to my Forma ).

Indeed, when I originally implemented the "preview" button on the Kindle screensaver hack, I resorted to a *double* flash to white before flashing the image... I don't recall which device behaved the worse at the time, because that was 6 years ago or so, but let's go with "an old one" .

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That said, funnily enough, flashing the same content (especially image content) multiple times *may* potentially yield worse results than only flashing it once, no matter the device. (It's certainly worse than flashing to white first in every case).

[DNSB]

AFAIR, you use a triple flash to clean up the screen. Write all pixels to white, write all pixels to black and then write all pixels to white. Writing to white alone will not do the job.

[NiLuJe]

Most waveforms deal very badly with from black transitions (see: nightmode being a ghosty mess), so I've never been a huge fan of the white -> black -> image approach.

Black -> white -> image *might* help in some very specific circumstances, though?

But in most cases, on current devices, flash white, flash image works out just fine.

EDIT: I spout way less nonsense after a good night's sleep . That's obviously why I insist on the "flash" part of the equation: that's precisely the mechanism providing a short switch to full black.