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Putting Masks in Motion

Bug Alert, or Not?

Does a bug still count as a bug if the development team knows about it and has decided to leave it as-is to be backward-compatible? I'll let you be the judge. Say there's one part of an overlaid element that you want to mask and reduce to partial opacity, say 50%.

You create a mask for the area to be dialed back, set it to Subtract, and set Mask Opacity to 50%. But instead of the anticipated result, displaying the layer at full opacity and the masked area at 50%, the masked area is subtracted 100% and the rest of the layer displays at 50% opacity!

This is the identical result to applying the same mask in Add mode with Invert checked, only in that case the behavior is at least anticipated.

The workaround is to add a mask at the top of the stack, giving the mask the dimensions of the entire layer (double-click the Rectangular Mask tool). The Subtract mask will now work properly relative to this first mask, set to Add mode.



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