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State whether the following is true or false.
Standard colorimetry assumes that only the cones are contributing to the response.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: B

Rod intrusion at low levels invalidates the standard observer functions. Minimum illuminance levels are specified to keep assessment in the photopic range. Cone vision alone is assumed throughout. Minimum illuminance levels are specified accordingly.

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