I'd like to know how to mask an effect without actually masking the entire image!
For example, I'm adding gaussian blur to some images at the moment and I just want parts of the image to be blurred. When I create a mask to try and concentrate the effect to one area the rest of the image goes alpha on me!
So my solution as of now is to copy the footage that I'm placing the effect on, so that the same footage shows - without the blurred effect - where the alpha is created on the top image. It works, but not brilliantly, for some reasons. And I bet there's some simple solution to my problem :)
[Martin H Eriksson]"When I create a mask to try and concentrate the effect to one area the rest of the image goes alpha on me! "
Well, that's what a mask does: it does not define the limits of something affecting the layer, it isolates a part of the layer itself.
The technique you used is just fine. The technique Dave Johnson describes is equally good. And when you use Dave's technique, do you know what you're doing to the adjustment layer? You're isolating a portion of it, because you're masking it.
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