A PhD student at the University of Michigan that Thomas Knoll, in 1987 wrote a program on a Macintosh Plus to display grayscale images on a monochrome display. Together with his brother John Knoll who are also employees of Industrial Light & Magic, turn it into an image editor program. In 1988 the two sisters with the name change ImagePro. After that year, Thomas renamed his program into Photoshop and work in the short term with the scanner's manufacturer Barneyscan to distribute copies of the program with a slide scanner; "A total of about 200 copies of Photoshop has been sent".
During that time, John traveled to Silicon Valley in California and gave a demonstration of the program to engineers at Apple Computer Inc. and Russell Brown, art director at Adobe. The second demonstration was successful, and Adobe decided to purchase the license to distribute in September 1988. While John worked on plug-ins in California, Thomas remained in Ann Arbor writing program code. Photoshop 1.0 was released in 1990 for Macintosh.
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