1. A printing system for printing colors with overlapped combinations of separately deposited separation colors, each separation color corresponding to a colorant, providing a trapping processor to vary the image to correct misregistration between colors due to imperfect placement of said separation colors, said trapping processor including; an input receiving signals representing sets of separation colors; a color conversion processor, converting separation colors to a new color space in which equivalent color differences in human color perception are approximately equivalent values; a visibility processor, determining for each color pair in said new color space, a visibility for any possible misregistration; and an image modification processor, suitable for altering a received image for trapping by said trapping processor.