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Decided to post what happens if I corrupt a bmp. The colour bands are actually caused by a bug in my old corrupting script, which is fixed in the one I posted.
Whereas I only had to corrupt 1-30 bytes with a jpeg/png, I had to corrupt 10000 bytes for this effect.
Using an old game cg this time since it was one of the few images I already had handy in bmp format.