1. A method of detecting flesh color in a color original comprising defining a flesh color point as one whose red, green and blue densities fall within a solid having an elliptical cross section when plotted in a three-dimensional coordinate system the three axes of which represent the red, green and blue densities or combination thereof, measuring the red, green and blue densities of a number or points in the original, and determining that any given point is of flesh color when the measured red, green and blue densities are within said solid in the three-dimensional coordinate system.