The Register: The GIMP Threatens PIN Number Security

“This must be a first: Linux image manipulation programme the
GIMP has been fingered as a possible tool in uncovering people’s
PIN numbers as sent through the post. It’s not all open source
gloom, though, Photoshop can also be used to, in certain
circumstances, enhance illicitly-obtained printed PIN numbers.

“That, at least, is the conclusion of University of Cambridge
reserachers who looked at the tamper-proof stationery used to
deliver said numbers to expectant punters…”