Red, Green, Yellow and Blue are not "all primary colors".
One of these things is not like the others, one of these things just doesn't belong. Maybe you remember it from sandwich bag ads from the late 80s/early 90's? And so another slideshow is closed.
Depends on which version of primary colors you use. For computer displays, they are : red, green, and blue. For art (painting), they are : red, yellow, and blue. So you could say all are primary colors.
Red, green and blue are the "additive" primary colours--the three primary components to making any colour with sources of light (computer displays and televisions generally emit light, hence the use of the RGB colour model for video media). You got that one right.
However two of the primary colours "for art" yo9u mentioned aren't technically correct (but they have an historical basis). The "subtractive" primary colours are magenta, yellow and cyan. This is where you get the "CMYK" cartriges for your printers. The K is for blacK (I guess it isn't called CMYB because blue already took the letter B...).
The additive and subtractive primary colours have complementary characteristics. If you combine the light from each of the additive primaries you get white. If you combine pigment of each of the subtractive primaries you get black. The subtractive and additive primaries are each exact complementary colours of each other (the complement of one primary is the combination of the other two primaries), hence:
Red -> complement is green plus blue = Cyan Green -> complement is red plus blue = Magenta Blue -> complement is red plus green = Yellow
That is how we get the acronyms for the primary colours: RGB is ordered by wavelength and CMY represents the complement of RGB.
Anyways, science hadn't established modern colour theory before much of the work done by renaissance painters was completed--colour theory of that time was based upon observation and aesthetics. They saw rainbows, came up with colour wheels, saw how their pigments blended and such and came up with their own set of primary colours. In this case they divided the colour wheel into FOUR parts and picked four primary colours such that each primary had another primary as a complement (it was all about subtractive colour theory too--they didn't know much about the additive primaries of light to have the six primaries we have now). Those colours are roughly RED, YELLOW, GREEN and BLUE (picked as they are the most prominent in rainbow spectrums observed in nature).
The colours of the Microsoft Windows logo are the four "renaissance painter's primaries". Each pair complements the other and are both bold and pleasing to the eye. The poster ianare is basically right, all four colours are pri,aries in one sense or another, though the details weren't quite complete.
Yes, the Black component can't be called 'B' because of Blue. It gets the 'K' because in printing it's often called the Key colour. (and the added bonus of having that letter in its name)
While the retina processes in terms of three colors, the brain actually processes in terms of four colors [wikipedia.org] (or six if you count black and white).
Well, I made it one slide (Score:0, Redundant)
Re: (Score:3, Interesting)
Depends on which version of primary colors you use. For computer displays, they are : red, green, and blue. For art (painting), they are : red, yellow, and blue. So you could say all are primary colors.
Re: (Score:2)
Re:Well, I made it one slide (Score:5, Interesting)
Red, green and blue are the "additive" primary colours--the three primary components to making any colour with sources of light (computer displays and televisions generally emit light, hence the use of the RGB colour model for video media). You got that one right.
However two of the primary colours "for art" yo9u mentioned aren't technically correct (but they have an historical basis). The "subtractive" primary colours are magenta, yellow and cyan. This is where you get the "CMYK" cartriges for your printers. The K is for blacK (I guess it isn't called CMYB because blue already took the letter B...).
The additive and subtractive primary colours have complementary characteristics. If you combine the light from each of the additive primaries you get white. If you combine pigment of each of the subtractive primaries you get black. The subtractive and additive primaries are each exact complementary colours of each other (the complement of one primary is the combination of the other two primaries), hence:
Red -> complement is green plus blue = Cyan
Green -> complement is red plus blue = Magenta
Blue -> complement is red plus green = Yellow
That is how we get the acronyms for the primary colours: RGB is ordered by wavelength and CMY represents the complement of RGB.
Anyways, science hadn't established modern colour theory before much of the work done by renaissance painters was completed--colour theory of that time was based upon observation and aesthetics. They saw rainbows, came up with colour wheels, saw how their pigments blended and such and came up with their own set of primary colours. In this case they divided the colour wheel into FOUR parts and picked four primary colours such that each primary had another primary as a complement (it was all about subtractive colour theory too--they didn't know much about the additive primaries of light to have the six primaries we have now). Those colours are roughly RED, YELLOW, GREEN and BLUE (picked as they are the most prominent in rainbow spectrums observed in nature).
The colours of the Microsoft Windows logo are the four "renaissance painter's primaries". Each pair complements the other and are both bold and pleasing to the eye. The poster ianare is basically right, all four colours are pri,aries in one sense or another, though the details weren't quite complete.
Re: (Score:2, Informative)
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Ya muppet, the K is for Key, couldn't you have googled it first? ;0)
Brain vs. Retina (Score:2)
While the retina processes in terms of three colors, the brain actually processes in terms of four colors [wikipedia.org] (or six if you count black and white).
Re: (Score:2)
Depends on which version of primary colors you use
I suppose they could be considered primary colors as far as the visible light spectrum goes:
Red
Orange
Yellow
Green
Blue
Indigo
Violet