Vision with Isoluminant Colour Contrast: 1. A Projection Technique and Observations

Abstract

An optical technique is described for projecting two-colour pictures with controlled brightness contrast, which may be set to zero—at isoluminance. Colour registration is maintained without adjustment or special setting up. It is suggested that colour- and brightness-contour registration in the visual channel is a problem which may be solved neurally by master brightness signals locking slave colour signals. The projection apparatus allows the supposed master brightness signals to be removed—at isoluminance—when contour disturbances should occur. Observations of this kind are reported.