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Originally Posted by Over
IWhy different resolutions in those different formats? Is MOBI format still made with PDA and pocket PCs in mind?!
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Image support and display:
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Mobipocket Creator will automatically resize / recompress images that take too much space so you do not have to worry about over-burdening your book with high-resolution pictures. The limit is 63KB (63x1024 bytes). Images above that size are resized or recompressed. With the JPEG format, this lets you use images of 600x800 pixels and above. If you need to finely control the resizing / recompressing of your pictures, use an image editing software to bring the size of the image below 63K in GIF or JPEG format before using it in your publication. It will be stored in the book without any modification.
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I'm not sure that the 63K bytes per image limit still applies in all cases, but none of the images in this MOBI was larger than about 82KB and the image resizing and compression appears to have been done automatically by MobiPocket software.
This isn't only a PDA issue, I'm sure that Amazon would rather download a 1MB file than a 4MB file and resolutions above 600x800 don't add much value to a Kindle ebook.