Figure D1.

The effect of LUTs on illumination discrimination thresholds for the data of Radonjić et al. (2016). (A) Thresholds computed based on the original illumination-based LUTs. (B) Thresholds computed based on the image mean LUTs. Transparent bars represent the main effect of chromatic direction of change (thresholds for each chromatic direction averaged over scene conditions). (B) Scatter plot of the threshold data calculated using image mean LUTs (image mean LUT) against threshold data calculated using the original illumination-based LUTs (original LUT). Twelve thresholds are plotted for each participant (4 Directions × 3 Scene Conditions), giving 120 points in total.