I used to demonstrate PS1 in my digital painting class. I would show that without a layer-based system it was still possible to create a composite using calculations feature. The process is incredibly simple… an alpha, a foreground and a background plus some addition and multiplication. Even art students understand it. I’m still blown away by how much functionality they managed to squeeze into an executable small encounter to email to someone.

FYI.., the version I used was registered to Apple. Apparently, the Knoll brothers demoed PS to apple and they promptly shared it amongst themselves and their buddies. Almost all illegitimate copies of it are derived from that pirated copy.

Fun fact… John knolls wife was the founding member of the Photoshop ‘Widows’ club… a home to people who have lost loved ones to software.