[Cin] gegl graphs

[Andrew Randrianasulu]

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.c


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-gegl.html?m=1

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)
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