Thread: Best practice to add an image
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Old 01-13-2019, 01:46 PM   #9
j.p.s
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Quote:
Originally Posted by PenguinCEO View Post
Sometimes images (jpeg, png, etc.) in ebooks are poorly rendered by the ebook-readers based on Pearl/Carta e-ink screens,

Does it exist a best practice to add images to ebooks aimed to maximize the visual rendering of images?
Quote:
Originally Posted by j.p.s View Post
Since e-ink is low contrast, many images would greatly benefit from contrast stretch.
Quote:
Originally Posted by Notjohn View Post
How would that affect those of us who read on tablets and phones? I have no statistics, but I suspect that e-ink readers are a minority of devices for reading ebooks.
As others have pointed out, the OP asked about e-ink, but you make some good points. Rendering on non-e-ink displays should not be disregarded (and they probably greatly outnumber e-ink displays). I think both can be accommodated. I've thought about this from time to time for years, starting when e-ink was on the rise and seemed promising to revolutionizing reading.

I think maps, drawings, and other nominally black and white illustrations should use the full dynamic range just as text is nominally full black on a full white background. Reading software on high contrast displays already addresses the harshness that can result from this by providing options to set other background colors such as sepia. This should also be done for images. Author/publishers can set the background for non-photographic images to be transparent, yet another reason to use PNG.

It is very frustrating to have to squint at poorly scanned maps and drawing that could easily be quite legible with proper contrast. 5 to 8 inch low contrast e-ink is a challenging medium for drawings and photographs but they are capable looking pretty good and publishers should at least put some effort into it.
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