Report Curves+ in Plugins - Publishing ONLY! Posted July 8, 2007 Is it just my limited understanding, or is the standard Alpha curves option just an on/off switch? barkbark00, I guess you tested the standard Alpha curves on a completely opaque image. Then yes, the curve nothing to "bend" because all alpha values are at 255. Equally, the regular built-in Curves tool has nothing to work with on a completely white image. Try the alpha curve on image with some (semi)transparent areas (for example AFTER having ran "my" curve) and you'll see :wink: Another possible use has been described in the post how to invert alpha.