Hi, "Branko Collin" <collin@xxxxxxxxx> writes: > Does <image>/Select/By Color what you want? I think Branko is right here. Color-To-Alpha is not suited for chroma-keying since it will remove all shades of blue from all colors in the image. Classic blue-boxing requires to clear only exactly the color defined as the blue-box background. This can easily be achieved using Select-By-Color with a small threshold followed by Clear. Salut, Sven