The additional information that TM30 can give is provided by two graphs that summarise the values relating to Rf, Rg and Hue Shift (a shift in the colour hue, or the perception of a false colour compared to what we would see in sunlight), and the second how the source works for groups of materials (99CES) for immediate understanding:
The “rendering” of the source is expressed with a series of explanatory graphics of the colorimetric and qualitative characteristics and 2 distinct indexes.
The fidelity index Rf, which describes the ability of the source to render colours.
It varies on a scale of 0 to 100 where 100 is perfect adherence. It is also possible to have Rf targeted on one of the seven reference areas. For example “Rf skin” refers to the ability of the source to express the colours relating to the reference area concerning skin tone. It is similar to Ra but can be lower given that the reference colours range from 14 to 99.
The Gamut index Rg, which expresses the saturation level of the colours lit by the source. It varies on a scale from 60 to 140.
Values lower than 100 indicate a decrease in saturation, higher values indicate an increase in saturation therefore more vivid colours.
Colours will be more or less saturated depending on whether they are inside or outside the reference circle.
The last in-depth graph is the detail of the deviation and rendering of semitones compared to the reference source that is represented by the following diagram: