| Brightness contrast and
constancy |
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| The apparent
brightness depends on the surrounding region |
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| • | brightness
contrast: a constant colored
region seem lighter or |
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| darker depending
on the surround: |
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| – | http://www.sandlotscience.com/Contrast/Contrast_frm.htm |
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| • | brightness
constancy: a surface looks the
same under widely |
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| varying lighting
conditions. |
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