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A few bit flips in an image are unlikely to be noticeable (it depends on the format though; uncompressed is obviously the most resilient, JPEG should be reasonably resistant too.

Also, I don't think images stay for too long in RAM. Your HDD definitively has ECC.

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I've had plenty of corrupt JPGs - they're certainly noticable since a single error tends to mess up an entire macroblock, often even the entire rest of the image.

Was fun finding a bunch of my own photos like that. Luckily that was on a disposable copy and not primary storage, but it was enough to put me completely off non-checksumming filesystems.

Actually jpg is not very resilient, there is artforms doing single-bit changes to jpg-files to end up with very strange images.

This is an adversarial error, I think it's pretty good against random errors. I'll do a test sometime.

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