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Appearance at the low-radiance end of HDR vision: Achromatic & Chromatic

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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.

Document Type: Research Article

Publication date: January 1, 2011

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, and a vibrant interactive papers session. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper presentation.

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