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Dominant wavelength of a colour is found by

  • A.taking the mean wavelength of the reflected spectrum
  • B.reading the peak of the colour matching functions
  • C.extending a line from the white point through the sample to the locus
  • D.measuring the wavelength at which the reflectance is at its greatest

Answer: C

Correct answer: extending a line from the white point through the sample to the locus

The construction runs outward from the white point through the sample and continues to where it meets the spectrum locus, and the wavelength at that intersection is the dominant wavelength. It gives a rough correlate of hue, and how far along the line the sample sits gives the excitation purity.

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