Quote:
Originally Posted by mbovenka
That is how TypeGenius works. You can't make the fonts 'blacker'; that would entail enhancing the contrast of the screen, and that's fixed; you can't change it through software. All you can do is make them bolder.
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Completely true. You cannot get a darker/blacker black in any way. Each eink screen has a fixed contrast ratio (how much darker black is than white).
The only other possible related setting is the Refresh Screen ratio. eInk displays are quite prone to ghosting effects, so some pixels are not as black as they could be because they are affected by their previous position.
I don't know exactly why, eInk displays usually perform better if they go through a complete black/white flashing cycle. New displays (like Pearl or Carta) can avoid this step but the image quality is somehow reduced with each update, and therefore at last they perform a full refresh every xxx page turns (screen refreshes).
In Kobo, this frequency is fully adjustable so if you want the best possible quality you should set it to 1 page... (Reading Settings)