Adobe Photoshop 1.0 arrived in 1990, including tools such as levels and curves for adjusting tonality and the clone tool for copying one part of an image to another.
In 1991, Photoshop 2.0 debuted paths and the pen tool, mechanisms for isolating images that proved useful in publishing. In a move that would be nearly unthinkable today, the box art for Photoshop 2.0 didn't change.
February 18, 2010 1:04 PM PST
Photo by: Adobe Systems
| Caption by: Stephen Shankland
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