[jfrancis]

Anybody use the lock transparency feature? I only just now came across it.

You could lay down a perfect round dot (as an unmoved brush stroke) on its own transparent layer, Lock transparency, then paint over it to your hearts content and render it into a ball without worrying about messing up that first round edge.

[balistic]

Neat, isn't it?

Though, once you've used it, trying to work non-digitally becomes that much more frustrating. "Undo" and "lock transparency" have ruined my patience for real paint.
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brian.prince|light.comp.paint

[antx]

I used to use the layer grouping function for the same result. You draw your shape in one layer (like i.e. a silhouette of a character), make another layer on top of that one and group them. Now you can paint in the upper layer without worrying about ruining the shape.
But I stopped using that technique because the edges always look so sharp and don't integrate into the rest of the picture. I learned it�s better to do worry about the shape and learn to actually paint them rather than using such tricks.

[jo]

Yeah, I use it occasionally.. it's really useful combined with the lasso-tool. Kinda like a dual mask, one static - one dynamic. (Even though it's often just useful to a certain degree.)