Feature request: save the mask from "Levels and Color" Tool

[Winfried]

Is is possible to a save mask function for this tool?
I think such a mask might be usefull for other transformations, e.g. shapenung, blurring, etc.

[jsachs]

I do not see an easy way to make the internal mask accessible to other transformations, but it is a good idea and I will continue to look for a way that is consistent with the other commands.