Adobe Systems' Photoshop software turns 20 years old on Friday. Photoshop got its start in 1987 when Thomas Knoll wrote software that could display grayscale images--those with a range of gray tones--on monitors that could show only black or white pixels. He and his brother, John Knoll, licensed the software to Barneyscan in 1988, then to Adobe in 1989. Adobe Photoshop 1.0 arrived in 1990, and in 1995, Adobe acquired Photoshop outright from the Knoll brothers. Thomas Knoll (left) still works at Adobe. John Knoll (right) is a visual effects supervisor at Industrial Light and Magic, where he worked on effects in several Star Wars movies, three Pirates of the Caribbean movies, and Avatar.Source: news.cnet.com/2300-10798_3-10002523.html
