Discussion
Lightness differs from brightness in that lightness is
Answer: C
Correct answer: judged relative to a similarly illuminated white reference
Brightness is an absolute judgement of how much light appears to come from a surface; lightness is that judgement made relative to a white in the same illumination. The relative form is the useful one, because it stays roughly constant as the light level changes - which is why a sheet of paper is white indoors and out.
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