An apparatus having a projection lens through which an image produced by a Braun or cathode ray tube or other image reproducing device is projected onto a viewing screen is further provided with a source or sources of colored light, preferably of at least one hue different from that of the projected image, and which is superimposed on the image projected onto the viewing screen. The source or sources of colored light may directly irradiate the entire area of the viewing screen with such colored light, or the panel of the image reproducing device on which the image is produced may be irradiated with the colored light.