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They're 96dpi images instead of text. It might look better with the whitespace cropped out (see attached), but rendering of low-res images is never great for reading.
If you want to work with screencaps (and sometimes, that's useful), find out if you can increase the resolution of the captured image, or zoom in before screencapping. (It's possible you can't screencap res might be based on monitor settings rather than the program you use.)
Ideally: convert *text*, not screen images, to ebooks; only add screencap images where they help prove a point--if you're saying, "this scholar used this exact phrase," you may wish to include a screencap of that phrasing, but otherwise, it's much better to work with text, even if it's patchwork-pieces of text from multiple sources. If you need it to be obvious that they're separate, put (vector-art) boxes around them, rather than using images.
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