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Originally Posted by u238110
Does anyone have a sense of what DPI to use for ebook images? It seems to me like many scans are artificially large in size. For example, 300 DPI is popular, and I don't know if that's always necessary. If the book is brand new, you can include large images in the ebook and then people will have the extra benefit of viewing the images in all their glory on a computer, but if you're just scanning an old book that has images that have been greatly downscaled already, then my only desire is to make the plainest digital copy of the book possible.
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I guess it depends a lot on the kind of image. Anyway, a useful rule is to scan at the highest optical resolution you can get in your scanner, and downscale in postprocessing. Do not think in terms of DPI, but in terms of pixels in the final image (and resolution of the ebook readers).
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Also, if I were to turn a PDF into an EPUB, and the PDF had a table, I would have to screen shot the table to make it an image and add it to the EPUB as an image, right? Is there a more sophisticated way?
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Yes, you could code the table in HTML (not likely to look nice in real devices) or reformat the information as a list or something similar.
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And I'd make the screen shot at any zoom level I desired, right? Because PDF uses vector/raster images, which have no intrinsic size, right?
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I'm not sure what you mean. If the PDF is already a scan, those are already images which have an intrinsic size, and you'd better extract the image than take a screenshot. With vector data, you can indeed take a screenshot at whichever zoom level you like, that's basically equivalent to changing the DPI when scanning.