[argyllcms] Re: Percentage gamut measurements (was Re: Re: Correction for wide gamut screens and/or RGB-LED?)

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 13 Apr 2010 12:41:36 +1000

Keith Winstein wrote:
A bit of a tangent, but thought somebody here might know -- is there an industry standard for how these "percentage gamut covered" figures are stated?

There's a (very poor and misleading) de facto standard.

I assume they put the gamut and the triangle formed by the monitor illuminants in the same colorspace, and say an increment in any direction is as good as any other, and calculate the fraction of the gamut's area covered by the monitor's triangle.

It's the xy chromaticity diagram triangle areas. The problems with this are:
* The xy chromaticity diagram is very perceptually non-linear.
* Gamuts are 3D not 2D.

You can use Argyll's "viewgam -i" to get a more meaningful gamut volume

Graeme Gill.

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