It's always best to place your sub jects fa r away from the green background to avoid as much of this spill as possible although the brightness of the background ma y still bleed over onro smaller subjects with details in the video. This is especially important if you're shooting with standard-definicion analog camera equipment that has interlaced even/odd fields ro deal with. In compositing, blue spill is less offensive on hair and skir tones, especially in night shots or composites where t he scene includes a lot of cool-colored light.