Blur and pixelation are not redaction
Pixelation is a deterministic transform over a tiny search space, blur leaks length and shape, and a black rectangle is an object sitting on top of text. Why each fails, and what a real redaction has to do.
Screenshots leak more than the picture shows. These are working notes on evidence handling — what survives in a file, what a redaction has to actually do, and how to check rather than assume.
Pixelation is a deterministic transform over a tiny search space, blur leaks length and shape, and a black rectangle is an object sitting on top of text. Why each fails, and what a real redaction has to do.
What to redact, why consistent pseudonyms keep a report readable, and the two checks that catch the leaks the picture does not show.
EXIF, embedded thumbnails, cropped-away pixels in the file tail, and selectable text under your black box — four things that survive, and the one-line check for each.