the whole world burns

Archive for August 2013

Xerox scanners randomly alter numbers in scanned documents


Incorrect application of JBIG2 compression (which builds a dictionary of image "patches" such that similar areas can be compressed into a reference to a single patch) apparently leads this Xerox scanner to silently mangle documents -- the patch size is such that it confuses 6, 8, and perhaps other glyphs.

Small things, links and miscellany, sparkling with light. Sam's tumblelog.