1987 Thomas Knoll begins writing graphics subroutines on a Mac Plus.
1987 Thomas teams up with his brother John and combines these subroutines into an app. called "Display."
1988 Refined version of Display becomes "ImagePro."
1989 BarneyScan licenses the application to bundle with their slide scanner. About 200 copies are shipped.
1989 Adobe strikes a deal to license what becomes known as Photoshop. They begin 10 months of product development.
1990 Photoshop 1.0 ships in February.
1990 Version 2.0, code name "Fast Eddy," ships in the fall.
1993 Version 2.5.1 is released. One of the first apps to run native on a PowerPC chip. Also first release of Windows version (April, 93).
1994 Version 3.0 ships with the "Layers" capability.
1996 Version 4.0 ships. Controversial key commands are changed.
1998 Version 5.0, which includes the "History"palette, ships.
1999 Version 5.5 ships: the first true "web ready" version of the app.
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