#58 Gamma value and historgam matching are not reset to the defa

[Olga Faber]

If you have changed a Gamma value for a RGB image
view or applied an equalized or normalized histogram
matching to RGB images and you then

want to undo your changes, you are expected to click
on the "reset to default values". The problem is,
however, the Gamma value and historgam matching are
not reset to the default value.