I notice the Kobo just makes the image fit the screen - so if too big it compresses it into small size, Maps suffer with this as they are too small to read. I always check that images are neither too big or at too high resolution as they can slow down devices and create over large documents. This is OK on a computer but might not be appreciated by someone downloading it to their phone. Unless you really need an image at incredible clarity a hi res huge image is a waste of space.
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