Blackmagic Forum

Hello, i've had this issue recently : when i'm doing a green screen and drawing a power window around the subject to be able to resize it without cropping off the background layer in the color tab, the power window gives a black background by default instead of a transparent one as you can see in the picture. I didn't have this issue at first, i might have clicked a button by accident. Please help me get rid of the black background. Thank you!