A new colour rendering index was developed. It has the following features: to use CAM02-UCS model including a robust chromatic adaptation transform and a uniform colour space, to apply 10° observer to remove the anomalies of the 2° observer in the close to blue area, to include 273 test samples to cover a large colour gamut corresponding to real world samples. It is a much improved CRI than the current CIE-Ra.
Yi-Fan Chou, M Ronnier Luo, Janos Schanda, Peter Csuti, Ferenc Szabo, G. Sárvári, "Recent Developments in Colour Rendering Indices and Their Impacts in Viewing Graphic Printed Materials" in Proc. IS&T 19th Color and Imaging Conf., 2011, pp 61 - 65, https://doi.org/10.2352/CIC.2011.19.1.art00014