Why are blue screens used in television and movies to edit the background rather than another colour? ?
A rather complex explanation: “Red, green and blue channels have all been used, but blue has been favored for several reasons. Blue is the complementary color to flesh tone–since the most common color in most scenes is flesh tone, the opposite color is the logical choice to avoid conflicts. Historically, cameras and film have been most sensitive to blue light, although this is less true today. Green has its own advantages, beyond the obvious one of greater flexibility in matting with blue foreground objects. Green paint has greater reflectance than blue paint, which can make matting easier. Also, video cameras are usually most sensitive in the green channel, and often have the best resolution and detail in that channel. A disadvantage is that green spill is almost always objectionable and obvious even in small amounts, while blue can sometimes slip by unnoticed. Sometimes (usually) the background color reflects onto the foreground talent creating a slight blue tinge around the edges.
