R96a Method
In the CIE's 1991 Quadrennial Meeting, Technical Committee 1-33 (Color Rendering) was assembled to work on updating the color rendering method, as a result of which the R96a method was developed. The committee was dissolved in 1999, releasing CIE (1999), but no firm recommendations, partly due to disagreements between researchers and manufacturers.
The R96a method has a few distinguishing features:
- A new set of test color samples
- Six reference illuminants: D65, D50, black bodies of 4200 K, 3450 K, 2950 K, and 2700 K.
- A new chromatic adaptation transform: CIECAT94.
- Color difference evaluation in CIELAB.
- Adaptation of all colors to D65 (since CIELAB is well-tested under D65).
It is conventional to use the original method; R96a should be explicitly mentioned if used.
Read more about this topic: Color Rendering Index
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