Relative luminance and figure-background segmentation problems: Using AMLA to avoid nondiscernible stimulus pairs in common and color blind observers

RESUMEN

Four experiments evaluated AMLA temporal version accuracy to measurerelative luminosity in people with and without color blindness and,consequently, to provide the essential information to avoid poor figurebackgroundcombinations in any possible “specific screen-specific observer”pair. Experiment 1 showed that two very different apparatus, a sophisticatedphotometer and a common luxometer, provide equivalent measurements tocompute (1) screen gamma exponents and (2) relative luminance (Y/Yn) ofachromatic but not of chromatic stimuli. Experiments 2, 3 and 4 showedthat the psychophysical task of AMLA temporal version provided, for anystimulus type, accurate relative luminance measurements. They wereequivalent to standardised photometric measurements for common observers(Experiment 2); similar to the expected distortions for simulated(Experiment 2) and real (Experiment 3) aged tritanomalous observers;concordant with the expected distortions of protanope observers(Experiment 4)