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I've commented on this elsewhere but XnView and XnConvert are cross platform programs (Windows, Linux and Mac) that can convert to and from a large number of formats. There is also a command line converter, NConvert.
I use both XnView and XnConvert to prepare images for OCR. Usually cropping headers and page numbers after running the images through ScanTailor. It has always (almost always) worked well for me.
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