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Volume: 19 | Article ID: art00038
Appearance at the low-radiance end of HDR vision: Achromatic & Chromatic
  DOI :  10.2352/CIC.2011.19.1.art00038  Published OnlineJanuary 2011

Human vision spans more than 10 log units of dynamic range of light response. That is the ratio of the radiances from snow on the top of a high mountain to the amount needed for dark adapted humans to see a light. That range is possible because of two types of retinal cells; rods (high sensitivity) and cones (daylight vision). There are many familiar spatial experiments in which equal local stimuli make unequal appearances in daylight. This paper tests whether Simultaneous Contrast, Adelson's Tower, White's Effect, Checkerboard and Dungeon Illusions, Benary's Cross, Color Contrast and Color Assimilation behave the same using rod vision. Since these experiments are the result of spatial processes, it is possible that the different anatomy and physiology of rods and cones could limit the range of these effects. Remarkably, spatial effects at the lowest end of our visual HDR range are very similar to those at the top of the range in sunlight. Different physiological systems, with different size receptive fields, generate similar spatial interactions.

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John J. McCann, "Appearance at the low-radiance end of HDR vision: Achromatic & Chromaticin Proc. IS&T 19th Color and Imaging Conf.,  2011,  pp 186 - 190,

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