Control Over Mask Opacity?
Trying to do something I'm not sure is possible in PS:
I have applied an effect to an image at 100% - say a black and white layer.
I then apply a mask to reveal some of the orignial image, but wish to have control of the opacity of this mask.
I know I can change brush opacity, but if I go over any part, it will keep increasing, or will it?
What I need it to have control of the revealed part of the image, in case I need to vary it somewhat.

