@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).