If you think your photocopier is producing exact duplicates of your documents, you might want to double-check — some popular Xerox scanners and photocopiers change text and numbers documents scanned and copied under the “normal” quality setting.
The “character substitution issue” might occur with “lower quality and resolution settings” — which are labelled “normal” quality on Xerox machines — confirmed Francis Tse, principal engineer for Xerox, in a blog post Tuesday, several days after German computer science student David Kriesel first noted the problem in a blog post that spread quickly around the internet.
This is evidently the imaging equivalent of auto-correct. And what makes it worse:
Kriesel wrote in a blog post early Tuesday that based on his experiments, using a “higher” quality setting did reduce the errors. However, counterintuitively, it reduced the readability of scanned documents, prompting many people to choose the “normal” setting.
Meanwhile, my crummy Kodak printer/scanner, which I bought from Woot for fifty bucks (plus $5 shipping), gives me nice, clean 300-dpi scans with little effort. Admittedly, they may take as long as a minute, and I don’t mean a New York minute; but I never have to question whether the output is true to the input.