Quote:
Originally Posted by JSWolf
How would you improve the contrast of an eBook?
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Not easily. It's the images the poster is concerned with. I'd make a copy of the ebook and unzip to a fresh location, then use a histogram tool with a preview to set black, white, gamma or even edit curve.
It can't be done at any quality automatically. If the image is palette based I convert to either full greyscale or RGB depending on if the image is mono or colour, before editing. I might resample, edit, sharpen or whatever too.
Long ago I used Aldus Photostyler, then Paint Shop Pro from 3 to 7, then The GIMP (originally on Windows). I did use Adobe Photoshop for a while. Not worth it for this sort of thing.
I'd only convert colour to monochrome (and maybe a 16 shade equal level palette) if the image is ONLY EVER going to be on eink.
Always only edit full RGB or full greyscale and if touching up, first rescale to x2 to x5 (x3 is good) and then downsample a copy when finished.