I've started playing with masks in Photoshop, and I can't figure this one out and I'm sure there is an easy answer. If I apply a mask to a layer, how can I copy that mask and use it on another layer. For example: say I g. blur a layer and paint the mask to hide some of the g. blur, then want to, say, apply a paintbrush filer to another layer but use the same selective mask I used for the g.blur layer, how can I do this. Or am I going about this all the wrong way? Maybe I don't need seperate layers? Also, any powerful tips in general on using masks would be appreciated. I can't believe I've come this far without learning to use them better.