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Answering the follow-up question, probably the easiest thing to do in these cases is to create a small ad-hoc filesystem and loop-mount it. Something like this: $ dd if=/dev/zero of=imgdisk.img bs=1M count=512 512+0 records in 512+0 records out 536870912 bytes (537 MB) copied, 0.425628 s, 1.3 GB/s $ du -h imgdisk.img 513M imgdisk.img $ mkfs.ext4 -b 2048 ...


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Different pieces of software report different disk space usage statistics in 2 ways. Files can have a size that is the number of bytes in a file, and a "physical size" which is the sum of the cluster sizes used by that file. The physical size, or "cluster size" is the minimum chunk the OS keeps track of when referring to space used on a disk. So if you have ...


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Try this GIMP plugin for performing a routine on multiple images simultaneously: "Batch Image Manipulation Plugin" http://registry.gimp.org/node/26259 Hope that helps. Have fun GIMPing!


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Why gimp? Try imagemagick package. It's a great command line image processor. In your case you can use it like: convert -negate src.png dst.png



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