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It's 800x600 exactly. I know this as i've written code to write directly to the framebuffer device, and that's how big it is. All 800x600 pixels are visible on mine.
However, the pixels right near the edge are hard to read even if they are not obscured by a mis-aligned bezel, mostly because of shadows or the angle of view: so software needs to add a border for usability, I don't know what border the kobo software is adding for title pages.
I've been reading text files and one gets a lovely blank title page everywhere they might show up - how so very useful ...
AFAIK the kobo uses a 16-bit RGB 565 mode for the display screen, so perhaps a 4 or 6 bit greyscale png would go through unchanged but that's only a guess. It's an odd choice and probably because they want to use the same code on different devices or maybe to simplify client-side dithering. The hardware itself (or driver) supports an 8-bit greyscale mode, although displays in only 16 shades.
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