Chromakeying
Compute Matte From Color Image
- Define a key color k
- At each pixel compute:
m = |(Rin - Rk)| * Rw +
|(Gin - Gk)| * Gw +
|(Bin - Bk)| * Bw
m = Output matte pixel
Rin, Gin, Bin = Input pixel
Rw, Gw, Bw = Constant weights for luminance conversion