Pro RGB...really?

Started Nov 8, 2012 | Discussions thread
Scott Eaton
Senior MemberPosts: 1,909
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myths about printer gamut range
In reply to alvie, Nov 9, 2012

One thing that has driven me nuts over the years is the exaggerated gamut range often referenced for printed out-put. Doesn't matter if it's dye or pigment based - there needs to about ten asterisks* posted behind any gamut plot for a printer.

The reason is that unlike displays printed media requires a *light source* for reference. The intensity and spectral slope of that light source has a direct amount on the shape and scale of the gamut plot referenced for printers.

Some years ago when I was preparing exhibition prints for a client we calculated how much LUX would be required at the surface of a print to equal the intensity of the light source built into the densitometer used to evaluate print color. Results were something on the order of 50% daylight sun at the equator. These light levels are totally absurd for conventional inside illumination levels for our prints and darn near make the common gamut spaces posted for printers work only in an abstract domain. Unless you intend to illuminate your prints outdoors or use six 400watt daylight halides 10 feet away reflective color spaces are much smaller in practical application.

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