Evaluation of uniform crt display scales with visual threshold data

Luminance, chromatic, and color visual threshold contrast data are found along the heated object scale at two mean luminance levels using a high resolution graphics monitor. Data from ideal stimulus characteristics (no or little noise and sharp contrast edges) and test stimulus sizes of 1.00( degrees ), 0.50( degrees ), and 0.25( degrees ) were obtained along with data for linearly stepwise blurred contrast edge stimuli in a noise pattern with test stimulus sizes of 0.50( degrees ) and 0.25( degrees ). All data were collected using an adaptive staircase with a spatial two alternative forced choice paradigm. The results suggest that uniform CRT display scales that have been perceptually optimized for ideal viewing conditions will remain uniform even though the contrast step sizes of the display scale will no longer be perceptually optimized in nonideal viewing conditions.