Adam D. Moss wrote:
The idea isn't that the layer mask usurps image alpha, but that traditional paint/fill tools are generally used to increase opacity and define colour simultaneously (they do), while layer masks are extremely handy ways to safely experiment with eroding opacity away again as a logically separate composition step rather than a destructive processing of the RGBA data. --Adam
I like this distinction. This should be written down somewhere. Probably in the manual (if it isn't already). This clearly describes precisely what approach to use when.
-- Dan
