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Another way to save space is to simply compress the images. Open the book in the editor, and there is a tool: Tools-->Compress images losslessly. This will give you some, usually small, compression, but in the dialogue there is a box to check for Enable lossy compression of JPEG images. Set this to about 50 in the compression quality box and it can save you significant space. A 1.5 mb jpg may go down to 150 kb...on that order, anyway.
I have a Forma, and found that this drastic compression has no visible effect on the picture you see on the reader. It is very fast and will do all the images at once. But if you have big png images it won't help much, and takes a long time.
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