If you plan to read comics on a 6" ereader there are few things to consider:
Amount of text - If the comic is text heavy, the comic is going to to be unreadable because the text is too small.
Colour - If there is a lot of similar colours, the contrast in greytones may not look good.
I had more success reading manga on my Kobo reader than American comics. (All manga is in black and white and majority of them are not text heavy)
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