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A colour space described as perceptually uniform is one in which

  • A.every colour can be printed on any press
  • B.the primaries are spaced at equal angles
  • C.no colour requires more than three channels
  • D.equal numeric steps look equally different

Answer: D

Correct answer: equal numeric steps look equally different

In a perceptually uniform space the distance between two colours corresponds to how different they look, so a sequence of equal numeric steps produces an evenly graded series. That is exactly what a sequential scheme needs, and it is why such spaces are used to design them rather than RGB or CMYK.

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