(under subclass 78) Subject matter wherein the contrast of the receiver is changed over the area of the frame or along the length of the continuous strip with respect to the contrast of corresponding areas or length of the carrier (i.e., the change in contrast over various portions of the receiver is different from any change of contrast of corresponding portions of the carrier by modifying the light intensity or duration).
(1) Note. In vignetting as classified in subclass 125 below, light is usually completely blocked and stray light around the blocking portion produces the diffusing effect. However, in this subclass 80 the contrast is modified by altering the light passing directly through or from the carrier object to be transferred.
