Does luminance contrast determine lightness?
When presented against a highly lit black background, dimly illuminated white paper strips appear white even when they are equiluminant with the background. Such an example of simultaneous lightness constancy cannot be accounted for by receptor gain control because of the equiluminance. Moreover, this demonstration shows that lightness cannot be reduced to 'relative brightness' as is widely believed.
Logvinenko
Alexander D
AD
Department of Vision Sciences, Glasgow Caledonian University, Glasgow G4 0BA, UK. a.logvinenko@gcal.ac.uk
D003198:Computer Simulation; D015350:Contrast Sensitivity / Q000502:physiology*; D003867:Depth Perception / Q000502:physiology; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008027:Light; D012160:Retina / Q000502:physiology*