Is GAMUT of a RGB system always a triangle on the chromaticity diagram?

[AE lover]

Hi all,

As I learn from school, all colors in a RGB system are generated by a
linear sum of three primaries. Also, on the diagram, a color A which
is an addition of two other colors (say B and C) always lies on the
straight line connect B and C.

Based on this knowledge, I guess the gamut of a RGB system is always a
triangle on the chromaticity diagram. Can you please confirm my
thinking.

Thanks

AE

[Mike Russell]

Ideally, yes. In practice most devices have a certain amount of cross talk
between channels. CRT monitors probably come the closest to being a
perfect triangle - LCD's, cameras, and printers (which are actually CMYK
devices) are less ideal, and their gamuts are triangles with curved sides,
whose shape varies with luminance.

--
Mike Russell - http://www.curvemeister.com

[Gerhard Fuernkranz]

AE lover wrote:
> Hi all,
>
> As I learn from school, all colors in a RGB system are generated by a
> linear sum of three primaries.

IMO there is one important word missing:
...all colors in an ADDITIVE RGB system...

But not every (arbitrary) RGB color space has additive characteristics.

Regards,
Gerhard

[AE lover]

Thanks Mike and Gerhard.Your answers are very helpful for me.

AE

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