I just received a follow-up email with some information with respect to the tech utilized at retroreveal. This may be common/old information, I don't know.
I've sent a follow-up to see who owns the rights to or has physical (digital) copies of the actual source code. If I make any headway I'll post here and also get in touch with Don privately.
RetroReveal was built on open source components, with an interactive web site that made it possible for people to process images in different colorspaces without needing specialized knowledge. However, it should be possible for people to replicate the functionality of RetroReveal on their local computer with the following components:
ImageJ - https://imagej.nih.gov/ij/
ImageJ was used to process images on RetroReveal
Color Transformer Plugin for ImageJ - https://imagej.nih.gov/ij/plugins/c...nsforms.html
Note, there is an updated plugin called Color Transformer 2 which may also be useful: http://www.russellcottrell.com/phot...sformer2.htm
Information taken from:https://web.archive.org/web/20220123224008/http://retroreveal.org/credits#ipcredits
Background information about color spaces:
Luo, M. R. (1998). Colour science. In The Colour Image Processing Handbook, ed. by S. J. Sangwine and R. E. N. Horne. London: Chapman & Hall (Springer). 26-66.
Palus, H. (1998). Colour spaces. In The Colour Image Processing Handbook, ed. by S. J. Sangwine and R. E. N. Horne. London: Chapman & Hall (Springer). 67-90.
A listing of Color spaces used on RetroReveal:https://web.archive.org/web/20220409054915/http://retroreveal.org/glossary