Why no RGB printers?

[sm139]

I was looking for a pritner to buy and just couldnt find out why they use CMYK instead of RGB.You'll need to use all three colours to get black but can't there just be seperated black ink?RGB gives better colour from what i've seen.

[C0LL0SS0S]

Actually there are seperat black cartridges 

[AlwaysFSX]

Have you ever changed the ink cartridges in a printer? There's a separate one for black. CYMK: Cyan, Yellow, Magenta, Key (which is the black). They also produce colors better.

[W-L]

I was looking for a pritner to buy and just couldnt find out why they use CMYK instead of RGB.You'll need to use all three colours to get black but can't there just be seperated black ink?RGB gives better colour from what i've seen.

 

One main reason is RGB when all mixed together produces the color white which is the same as the paper your printing on where CMYK can produce black when black ink is not available, also using CMYK you can get the primary colors of RGB from it getting more color depth.

 

[Robi_g]

One main reason is RGB when all mixed together produces the color white which is the same as the paper your printing on where CMYK can produce black when black ink is not available, also using CMYK you can get the primary colors of RGB from it getting more color depth.

 

Maybe with light, but if you mix RGB paint together it's still black

[Interfectorem]

One main reason is RGB when all mixed together produces the color white which is the same as the paper your printing on where CMYK can produce black when black ink is not available, also using CMYK you can get the primary colors of RGB from it getting more color depth.

 

You're mixing up pigment-based color and light-based color. Mixing Red, Green, and Blue paint (pigment) does not produce white. Mixing Red, Green, and Blue light does however create white. Don't confuse pigment and light.

[NumLock21]

Some printers has more colors than just the standard CMYK, it has C, LC, M, LM, Y, K

[Sakkura]

Maybe with light, but if you mix RGB paint together it's still black

 

RGB is an additive color model, not a subtractive color model. When using pigments, and thus subtractive lighting, you need to use a subtractive color model for optimal results. CMYK is the most common one.

 

Edit: The middle part of this image demonstrates the problem with subtractive RGB: