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The TM-30 method was developed to address the limitations of the colour rendering index by

  • A.using many more samples and reporting fidelity and gamut separately
  • B.using rather fewer samples so that the calculation runs more quickly
  • C.removing the need for any reference illuminant at all
  • D.measuring only the ultraviolet content of the source

Answer: A

Correct answer: using many more samples and reporting fidelity and gamut separately

TM-30 answers the two main criticisms of the older index. It uses 99 samples covering the colour space and the range of real object spectra rather than eight pastel ones, and it separates fidelity, meaning how little colours shift, from gamut, meaning whether they are rendered more or less saturated - two things the single index conflated.

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