Hmm, not sure I follow then. Because stuff is actually inverted during the black flash (i.e., letters are white, background in black).
What I was talking about is the side-effect of the black-flash that's usually perceived as a lightening of the font (it eats away at the fuzziness around the edges, so: no more ghosting, sharper fonts, but possibly perceived as 'lighter').
Are you or are you not using the black flash on every page turn?
The Kobo Glo *might* also be using the weird checkerboard flash, it's been a while since I've seen one in person and in good lighting condition.
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