a color plotter includes a photoexposure head that projects a beam of polychromatic light onto the photosensitive surface of a color film . the beam of light exposes a spot on the film surface and means are provided for moving the spot across the film surface in a controlled manner to generate a desired pattern or line . color separation filters are mounted in the exposure head and a mechanism moves the respective filters into and out of the beam of light in accordance with a desired color in the plot . a density selector is also provided to control the degree of film exposure and the resulting color density . the color plotter is capable of producing maps , drawings and other graphic material in multiple colors on the exposed film .