Mark's Databender

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JPEG Quality

Quality

Re-encodes the source image to JPEG before corrupting it. Higher quality means more compressed scan data to work with.

Corruption

Amount Max chunk size

Corrupts the raw JPEG's compressed scan data directly — the file header stays intact so it keeps decoding, but the entropy-coded pixel data doesn't.

Tone Clipping

Low pass High pass

Low pass crushes shadows to pure black past a luminance threshold; high pass crushes highlights to pure white. Both do nothing at 0 and clip at the 50% luminance point at full.