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Well you dont have to do it one by one. You can shift click to select all the png's in the editor, right click and change their extension to jpg. Then close the editor and use the unpack book tool which will give you the book contents including all image files in a folder. You can then use a simple script to actually convert the files (which are named .jpg but are actually png) from png to jpeg. Once that's done the unpack book tool will rebuild the ebook.
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