Adobe Photoshop
Source Code
The source code of Adobe Photoshop v. 1.07 has been released by the Computer History Museum in Mountain View and can be downloaded at: Adobe Photoshop Source Code

Adobe Photoshop 1.07 splash screen
Software
- Early versions of Photoshop (0.63 (beta), 1.0, 2.x, 3.0, 3.0.4, 3.0.5, 4.x, 5.x, 6.x) are available at WinWorld
Papers, Blog Posts and Websites
- Manovich, Lev. 2012. „Inside Photoshop“. Computational Culture: a journal of software studies, Nr. 1 (Januar). http://computationalculture.net/article/inside-photoshop.
- Short overview of the early history of Photoshop (and its immediate precursors) up to the release of version 1. PhotoshopNews
- Screenshot of old versions of Photoshop; version 1.0 (1990) up to CS2 (1990) GUIdebook > Applications > Photoshop
Videos
John Knoll “reenacts” a demo of Photoshop v. 1.0 in 2010Startup Memories – The Beginning of PhotoshopThe Beginning of Photoshop: Thomas Knoll, John Knoll & Russell BrownPhotoshop Magic: A lecture by digital artist and author Bert MonroyMastering the Pixel : 25 Years of PhotoshopArt
- Constant Dullart: Dear Jennifer:
- Rosa Menkmans website “beyond resolution” presents her artistic research which she terms “Resolution Studies”. The section on the Genealogy contains a discussion of the practices and politics of test images in which she touches on Photoshop as well. ▋▅▉▝▊ || beyond resolution