Practice question · True or false
Lightness constancy works because the eye measures the amount of light arriving from a surface and reports it accurately.
Hints
- Ask what would follow if that were true.
- The white paper in shade sends less light than the black paper in sun.
Show the answer
False
Why
False, and the reverse of the truth. If the eye reported the arriving light, a white paper in shade would look darker than a black paper in sun, which it does not. The visual system estimates the surface by discounting the illumination it infers from the whole scene.
Practise The Principles of Visual Perception
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