I wanted to create a monochrome twinkle on my trees that matches a color wash on my house, so I took the color wash and added it as a layer to my trees. After some fiddling, I was able to get it to work by making the top color wash layer as "2 is Unmask", and the bottom twinkle layer as "Average".
The thing is, about 1/3 of the way through the effect, it starts "falling apart" and the pixels that twinkle start to disappear until I get darkness.
I've spent a well over an hour trying everything that I could think of (color brightness curves, buffer settings, roto zoom, in/out transitions, etc.) to prevent this from happening. I tried changing the color wash to a basic On effect with no difference. If I move each effect to separate times so they aren't layered, the twinkle effect lasts as long as it's supposed to... slide the color wash back on top, things start to "fall apart" again.
Any ideas??? I've attached sample files.
Thanks in advance...