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Colour constancy describes the tendency of a viewer to

  • A.see a colour as unchanged under different light
  • B.recall a colour accurately over a long period of time
  • C.match two colours placed far apart on the same sheet
  • D.prefer strongly saturated colours to muted ones

Answer: A

The eye discounts the illumination, so a map read under daylight and under a tungsten lamp still appears to carry the same colours. It is a help rather than a hindrance, but it does not extend to the fine judgements a close legend demands.

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