METHOD FOR PRODUCING AN IMAGE ON A SUBSTRATE HAVING THE SAME SPECTRAL CONTENT WITH FRONT AND BACK ILLUMINATION

摘要

A method for producing a large scale color graphic that presents substantially t he same spectral content to a viewer (78, 86) when the graphic is illuminated with front (72) or back (80) lighting includes a pplying an ink film (64, 66) on a first surface (60) and a second ink film (68, 70) on a second surface (62) wherein the ink film cre ates the desired colored graphic image and which images produced are in registry with one another. A light source (72) located on the same side as an observer (78) viewing the image passes light (74) through the ink film (64) in one direction and is reflec ted back through the ink in a substantially opposite direction so that light (76) reaching the observer passes through the equivalent of two ink film thickness. A light source (80) located in back of the image so that the image is between the light source (80) and an o bserver (86) passes light (82) through the first (70) and second (66) ink film layers in a direction toward the observer (86) so that the observer (86) views light (84) having a spectral content that passes through the equivalent of two ink film thickness an d replicates the spectral content of light from a light source (72) located on the same side as the observer (78).