Spaced Ranger said:
As you can see, one can do anything to the curve (with enough control points) to do anything to a picture or to parts of a picture. Dangerous territory. :)
Thanks I havnt got my head round histogram adjustment yet but I have been playing with gradiation curve filter (along with film color filter) in virtualdub, to improve on a very red shifted VHS source, I have not been trying to push it to meet a reference on this but just try to get the skintones more back into the realistic range. Sometimes this just looks like going from red to a more palatable orange:
original https://vimeo.com/62410166
filters https://vimeo.com/62332689