The source code is available for Photoshop

The source code for Photoshop 1.0.1 is free to download. It remains subject to some rules of use, such as not to make commercial use. If you want to try the adventure ... but it is indeed available. The Computer Museum in Mountain View, California proposed for the site with the consent of the publisher. According to one researcher from IBM; this code, which refers to the year 1990, totaling 128 000 as against 10 million reached today. He leaned on the structure of this little treasure, sometimes with accents admiring its clarity. He found also that the approaches found in the current version of Photoshop.

 The Computer Museum recalls the story of the birth of Photoshop, born "Display" and the efforts of both Knoll brothers, Thomas and John. The first student was the second employee at Industrial Light & Magic of George Lucas. Thomas wrote this program in 1987 to manipulate images without objective of making a commercial product, simply a tool for both brothers.

 This potential is revealed over the next year in the evolution of software, which then became "Photoshop". The first company to show interest was Barneyscan, manufacturer of scanners, which took 200 copies of the software - rechristened Barneyscan XP - to include with its peripherals. Adobe bought one license in April 1989 and marketed the following year under its final name. 3 million copies were sold in 10 years. The software was written in Pascal for the Mac, with some portions in assembler for the 68000 processor when good performances were necessary in the performance of tasks.