Using Gamut Rings to analyze color volume
August 20, 2024
Starting with Calman 2024 R6 (v5.15.6), it is now possible to visualize the three-dimensional color volume of a given display in a two-dimensional view called Gamut Rings. Traditionally CIE 1931 or CIE 1976 chromaticity diagrams that offer a two-dimensional perspective have been used. Calman’s Gamut Rings layout provides a way to visualize three-dimensional gamut volume as a series of rings in two dimensions. By industry standard, the CIE Lab* color space is used. Since this color space provides some predictors of color appearance (lightness, chroma, and hue), it allows us to quantify gamut volume in perceptually meaningful ways. A display’s white point changes how color is perceived so comparisons are made to the same illuminant (D50 in the device-independent colorspace).
The CIE Lab* gamut rings layout measures 602 points and calculates color gamut volume. What matters for a display is how much of a reference color space you can reproduce when receiving a particular video signal. Gamut Rings conveys how well covered the reference gamut is that is being targeted. High luminance capability doesn’t always equate to a high color brightness performance.
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