SetBGColor
Function This function is often used for adjusting keys, as the keyer may be pulling a bluescreen, and therefore will assign the area outside of the DOD, which is black, as an opaque foreground. If the element gets scaled down and composited, you would not see the background. The solution is to insert a SetBGColor before the keyed element is placed in the composite, i.e., ChromaKey -> SetBGColor -> Scale -> Over. See About the DOD for more information.
image Set( image In, const char * mask, float red, float green, float blue, float alpha, float depth );
image = Set( In, "mask", red, green, blue, alpha, depth, );
shake -set channels value |