So, I was looking second time at gegl's exposure compensation tool.. description: https://ninedegreesbelow.com/photography/gimp-tone-map-with-levels.html Tool code lives as https://gitlab.gnome.org/GNOME/gegl/-/blob/master/operations/common/exposure... but I found that you can use gegl from command line, but may be test it inside gimp first and then export xml/text file for reuse https://barefootliam.blogspot.com/2022/12/gegl-plug-ins-for-gimp-part-two-ge... I wonder if some of those "bring values to specific range, like 0.0 - 1.0f" operations deserve their own plugin in cinelerra (if we ever debug those "unbounded" floating point operations)