Test 3, 'Lost intro', saw us delete the first 8KB of every file (that is, the corrupted file started at original file byte 8193).
This would be a little more difficult to fix, but should still be recoverable. Test 2, 'Zero Header', was an extension of the same idea, zeroing the first 32 bytes. No critical data was lost, so we would expect any capable recovery tool to fix the problem. Test 1, 'Zero Signature', was the simplest: we just zeroed the first two bytes in every image. And so we set about creating some, by intentionally damaging four groups of images in very specific ways. To benchmark our repair tools we needed some corrupted JPEGs. To find out, we've tested seven of the most well-known contenders, and the differences are absolutely amazing: some programs really deliver, while others are entirely useless.
They're almost all commercial products, but if you want to fix corrupted photos then you can always pass your images through their trial versions, which will give you an idea of what can be recovered (although repaired images tend to come with a bulky watermark until you buy the full package).
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