About 200 photos of the suspect with 12 different young boys were located on the Internet in December 2004, an Interpol official said. But in each image, his face was obscured, apparently by use of a standard Adobe Photoshop effect called twirl, which is used by digital artists to manipulate images.Link UPDATE: The Interpol's fantabulous untwirling secret is a built-in Photoshop feature, according to BB commenter DHL: "The technique is very simple. In Photoshop, make a round marquee centered on the centerpoint of the twirled image, then full negative setting on the twirl filter. I was able to download a larger image from the Interpol site and it worked perfectly."
Apparently, the suspect, or whoever handled the pictures, did not think it was possible to reverse the twirling, a capability that at least one Interpol official was intent on keeping confidential.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects