Three-colour LED's / Red + Green

Jan Dupont · 22nd December 2003, 09:21 PM

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 · 22nd December 2003, 10:48 PM

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 · 22nd December 2003, 11:00 PM

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 · 23rd December 2003, 12:54 AM

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 · 23rd December 2003, 07:35 AM

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 · 23rd December 2003, 07:37 AM

Brown is actually yellow with a reduced luminance component

22nd December 2003, 09:21 PM	#1
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	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 ????? __________________ Jan Dupont (formerly known as ACD) B.Sc.EE Personal audio website with free schematic and service manual downloads www.audio-circuit.dk

23rd December 2003, 07:35 AM	#5
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	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!! __________________ Jan Dupont (formerly known as ACD) B.Sc.EE Personal audio website with free schematic and service manual downloads www.audio-circuit.dk

23rd December 2003, 07:37 AM	#6
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Brown out... Brown is actually yellow with a reduced luminance component __________________ John _____________________ Diy site: http://homepage.mac.com/dhaen/OnRyoku/OnRyoku.html Trading site: http://www.keystrobe.com

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22nd December 2003, 10:48 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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.

22nd December 2003, 11:00 PM	#3
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	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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