Several years ago virtually at the point when Adobe bought and shutdown Macromedia Freehand, I had, with the assistance of my son, worked out how to generate pseudo-highlights using fractals. At the time I was working with archival images where the Ektachrome slides had either been underexposed or had degraded where the highlights were either blown or lost.
I made a series of new slides which I bracketed from the correct exposure to progressive stages of being blown out. What I discovered was that from the first two overexposed images (half a stop, and a whole stop) it was possible to regenerate the lost highlights from the edges of the adjacent pixels. In comparison to the master slide it was impossible to see any difference between it and the first level ‘overblown’ test sample and only just detectable in the one-stop sample.
Would such a routine be possible to offer as a plugin?
It would be an extremely useful add-on for conservators and archivists with Important photographic colour transparencies in their collections.