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Converting from XYZ to CIELAB requires

  • A.a non-linear function of the ratios to the white point
  • B.a simple linear matrix multiplication only
  • C.the spectral reflectance data rather than tristimulus values
  • D.the observer to make a visual match first

Answer: A

The cube root style function is applied after dividing by the white. This non-linearity is what makes the space approximately uniform. A linear matrix alone would not suffice. Non-linearity is what produces the uniformity.

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