How to figure out Color Gamut?

brighteyes70s

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Sep 7, 2011
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I recently asked Viewsonic what their Color Gamut was on their VX2453MH-LED monitor. I have no idea how to figure out the percentage from this mess. Help?

Red X - 0.641 Green X - 0.315 Blue X - 0.159 White X - 0.313

Red Y - 0.338 Green Y - 0.629 Blue Y - 0.059 White Y - 0.329

 
Well, that works for one color, but what if you want the total gamut? I mean, are you supposed to add them all up and then divide them between how many colors for X and Y to get some kind of average?