Hi Kevin
Sorry for not understanding me, assuming I have only 1 layer, all I want to do is to apply an effect to a certain place in the layer, which I can select using a rectangle.
thanks for the answer, but I actually wanted to apply the effect only to a part of the layer (only the green screen, the problem is that it keys out also other green pixels in the frame. The camera doesn’t move, so it should be possible ..).