Color Demo

LIGHTS: For additive mixing, imagine a white screen in a dark room. Three flashlights (red, blue and green) can illuminate the screen, each with an adjustable brightness. The three circles of light may overlap.

FILTERS: For subtractive mixing, imagine an extended white light source (e.g. a white screen uniformly lit with white light). The source is viewed through three filters, which may overlap, and which are available in a variety of densities. One filter passes all but the red light (i.e., green and blue, or cyan), the second passes all but the green light (i.e., red and blue, or magenta), and the last passes all but the blue light (i.e. red and green, or yellow).