Brain Teasers User Profile
Tania Lei Hutchison
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Frederic Eugene IvesBorn 17 Feb 1856; died 27 May 1937 at age 81.American photographer and inventor of the halftone process, a method of reproducing photographs on a printing press. Prior to this process, photos and illustrations were reproduced from hand-engraved plates. In this way printers could reproduce line drawings, but not the shades of gray in a photograph because printing presses cannot print gray - only black and white. Ives invented a screen that would convert a photograph into a pattern of tiny dots. Large dots form where the image is dark, and tiny dots where the image is light, thus giving the illusion of shades of gray. In 1881, he was the first to make a three-colour print from halftone blocks. Further inventions in photography and colour printing yielded 70 patents.(Image: 1996 U.S. postage stamp.) |
I never wear...
I never wear a Halloween costume... I'm a character all year long!