Discussion
Value, as a visual variable, refers to
Answer: D
Correct answer: the lightness or darkness of a tone
Value is one of Bertin’s visual variables and means lightness alone - how much black or white a tone contains, independent of its hue and its saturation. Because the eye reads light and dark as ordered, value is the variable that carries quantity in a choropleth, and it is the one that survives conversion to greyscale.
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