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Old 22nd December 2003, 08:21 PM   #1
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Question Three-colour LED's / Red + Green

Just can't remember...
I know that Yellow+Red=Orange, and Green+Yellow= blue...
But if I use a three-colour LED Red+Green, what is the colour when both LED's are on ?????
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Old 22nd December 2003, 09:48 PM   #2
sreten is offline sreten  United Kingdom
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Yellow is not a primary colour, They are red, green and blue. (RGB).

Different levels of red and green will take you through orange and yellow.

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Old 22nd December 2003, 10:00 PM   #3
Bricolo is offline Bricolo  France
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in fact, the primary colors are cyan magenta and yellow


the red/green/blue are the colors you use to create the other colors in a led, a tv... everything that makes the light itself

you can also make all the possible colors with the primary ones, but for things that don't emit the light themselves (a painting, in example)
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Old 22nd December 2003, 11:54 PM   #4
dhaen is offline dhaen  Europe
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For emissive sources RG&B are normally considered the primaries. However, you could use any colours that are reasonably spaced, to be at the edge of your gamut.
You can also use more than 3.

Edit: better cie1931 chart attached, and typo's fixed
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Old 23rd December 2003, 06:35 AM   #5
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Thumbs up Thanks guys

I know the primary colours, but couldn't just figure out the result of the mixed Green+Red light....... (I ended up with brown, which is not a colour for a LED )

So when I mix Green+Red, I should get a kind of orange/yellow!!
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Old 23rd December 2003, 06:37 AM   #6
dhaen is offline dhaen  Europe
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Default Brown out...

Brown is actually yellow with a reduced luminance component
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