Three-colour LED's / Red + Green

[Jan Dupont]

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 ?????

[sreten]

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.

sreten.

[Bricolo]

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)

[dhaen]

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

[Jan Dupont]

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!!

[dhaen]

Brown is actually yellow with a reduced luminance component