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AE lover
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 Posted: Sat Jun 07, 2008 11:17 pm Post subject: Is GAMUT of a RGB system always a triangle on the chromatici |
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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 |
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Mike Russell
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| Posted: Sun Jun 08, 2008 11:04 am Post subject: Re: Is GAMUT of a RGB system always a triangle on the chroma |
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On Sat, 7 Jun 2008 16:17:41 -0700 (PDT), AE lover wrote:
| Quote: |
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.
|
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 |
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Gerhard Fuernkranz
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| Posted: Sun Jun 08, 2008 11:04 am Post subject: Re: Is GAMUT of a RGB system always a triangle on the chroma |
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AE lover wrote:
| Quote: |
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
| Quote: |
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
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AE lover
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| Posted: Sun Jun 08, 2008 7:41 pm Post subject: Re: Is GAMUT of a RGB system always a triangle on the chroma |
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Thanks Mike and Gerhard.Your answers are very helpful for me.
AE
On Jun 8, 1:37 am, Gerhard Fuernkranz <nospam...@gmx.de> wrote:
| Quote: |
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
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- Hide quoted text -
- Show quoted text - |
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