jit.chromakey Keying based on chromatic distance The jit.chromakey object measures the chromatic distance of each of the left input's cells(pixels) with a reference color (a.k.a "green screening"). The total chromatic distance is calculated by summing the absolute value of each color channel's distance from the reference color's corresponding color channel.	from the library : Jitter Format : External Environment : jitter commercial Max 4.x http://www.cycling74.com