I have 2 layers. The top one is a png image. Some parts have color and some are transparent. The bottom layer is a video of a transition on grey scale. I have my top layer blend mode set to multiply, so it's only fully visible when the bottom layer is white and fully transparent when the bottom layer is black.
It works as expected, but as I said, the top layer has some transparent parts, and on those parts, the bottom layer is visible when it's white.
Is there any way I can hide the bottom layer but preserve the effects it causes to the top layer? Or hide the bottom layer parts that are transparent on the top layer?