Why RGB??? what happened to yellow?

[Analog]

OK, this has something to do with my nick, but isn't yellow a primary color? Why did green get thrown in instead?

 

[Entity]

There is a difference between the visible light spectrum and primary colors as seen on paper, etc.

http://www.rgbworld.com/color.html

Rob

 

[KingNothing]

Yellow is a primary color if you're talking about printing, i.e. Cyan Magenta Yellow Black (CMYK). IIRC, printing uses "color subtraction" to do its thing.

Light, on the other hand, uses "color addition". So red + green make yellow.

Edited for stupidity and ignorance

 

[MercenaryForHire]

Originally posted by: KingNothing
Yellow is a primary color if you're talking about printing, i.e. Cyan Magenta Yellow White (CMYK). IIRC, printing uses "color subtraction" to do its thing.

Light, on the other hand, uses "color addition". So green + blue make yellow.

Red + green = yellow

R G B
C M Y

The two primary sets mesh into

R Y G C B M

- M4H

 

[BigJ]

sorry, yellow isn't a primary color as referring to the vision of humans. According to our eyes, there is no "natural" yellow. Via the primary colors, you're supposed to be able to make any color imaginable.

This page here goes into all that stuff regarding CMYK vs. Normal vision etc, interesting read.

 

[brxndxn]

sorry, yellow isn't a primary color as referring to the vision of humans. According to our eyes, there is no "natural" yellow. Via the primary colors, you're supposed to be able to make any color imaginable.

I always thought yellow just looked like a cross between orange and white.. But when I told that to my kindergarten teacher, I was WRONG. WRONG WRONG WRONG. /me goes postal.

 

[notfred]

Originally posted by: KingNothing
Yellow is a primary color if you're talking about printing, i.e. Cyan Magenta Yellow White (CMYK). IIRC, printing uses "color subtraction" to do its thing.

Light, on the other hand, uses "color addition". So red + green make yellow.

Edited for stupidity

The K in CMYK is black, and you combine red and green to make yellow in RGB.

 

[dakels]

CRT's display additive color
Print (and about everything else you see) is subractive color.

You should look up "color" or "color theory" or "RGB". There are a billion and one sources of info about it. People make a living out of this subject and you can get degrees on it.

btw the primary colors for a CRT or additive color sources is Red, Green, Blue.
The primary colors for print are Cyan, Magenta, Yellow, blacK
The primary colors for painting are Red, Yellow, Blue

The primary color recognition cones for the human eye are Red, Green, and Blue

 

[Viper GTS]

My printed pages don't match what I see on my monitor, FIX IT!!!!!!!!!!!!

Ahh this thread brings back nightmares.

Viper GTS

 

[TekViper]

roygbiv!

 

[dakels]

dam you guys are fast

and btw the range of colors that you can display using a certain primary colors like RGB or CMYK is called the gamut. Due to the different ways printers and monitors display color, there are colors within the RGB gamut that the printer cannot reproduce on paper and vice versa.

 

[flavio]

As a painter taking a Computer Architecture class I was similarly confused when RGB came up. I questioned it in class and the teacher acted as if I was insane when I asked about yellow. I din't get a decent explanation until we had a substitute a week later.

 

[KingNothing]

Originally posted by: notfred

Originally posted by: KingNothing
Yellow is a primary color if you're talking about printing, i.e. Cyan Magenta Yellow White (CMYK). IIRC, printing uses "color subtraction" to do its thing.

Light, on the other hand, uses "color addition". So red + green make yellow.

Edited for stupidity

The K in CMYK is black, and you combine red and green to make yellow in RGB.

You know, I never thought it made much sense for K to be white but that's what I always thought it was.

 

[Analog]

thanks for the tips.

 

[MichaelD]

This is a cool thread. Some of it I knew, some I didn't. I be much smarter now.

 

[PliotronX]

Originally posted by: brxndxn

sorry, yellow isn't a primary color as referring to the vision of humans. According to our eyes, there is no "natural" yellow. Via the primary colors, you're supposed to be able to make any color imaginable.

I always thought yellow just looked like a cross between orange and white.. But when I told that to my kindergarten teacher, I was WRONG. WRONG WRONG WRONG. /me goes postal.

My KG teacher would've given me 100 standards for even suggesting such a thing. Then called my parents and told them I needed Ritalin.