In real-life art, we use Red Blue Yellow system to create other colors. But why do we use Red Green Blue in computer?
Why RGB - Red Green Blue?
- Thread starter vtqanh
- Start date
Dunno... primary colors are Red, Blue, Yellow so it would make sense to use them, huh. I never thought about that... 
Maybe Hexidecimal doesn't like yellow
nik
Maybe Hexidecimal doesn't like yellow
nik
I've never really understood that either. Red, Blue, Yellow should be able to make everything that Red, Green, Blue can....maybe even more.
Someone enlighten us
Someone enlighten us
Random Variable
Lifer
- Aug 10, 2001
- 10,420
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RGB are the additive primary colors; RBY are the subtractive primary colors.
EDIT: In other words, RGB is for mixing light; RBY is for mixing pigments.
EDIT: In other words, RGB is for mixing light; RBY is for mixing pigments.
<< RGB are the additive primary colors; RBY are the subtractive primary colors. >>
and that means........?
Edit: beat me to it vtqanh
Also when you mix paints and you mix light, the results are easily comparable.
In other words combining colors on monitors is not the same science as combining colors on paper.
In other words combining colors on monitors is not the same science as combining colors on paper.
<< Also when you mix paints and you mix light, the results are easily comparable.
In other words combining colors on monitors is not the same science as combining colors on paper. >>
So Green is easier to mix with Red and Blue than Yellow is?
Random Variable
Lifer
- Aug 10, 2001
- 10,420
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The primary colors of REFRACTED light are red-orange, green, and blue violet; yellow is one of the secondaries, along with magenta and cyan. Combining the three primary colors of light will produce white light. Does that help?
Red, Green and blue are the fundamental colors of light. In theory you should be able to make any color with those three. Cyan, Magenta and Yellow are fundamental color on physical matters and mixing these should be able to create any color. I don't know know about transparentness, metallic color and such though.
Random Variable
Lifer
- Aug 10, 2001
- 10,420
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EDIT: I'm getting the additive and subtractive primary colors mixed up. Let me try again:
Red-orange, green, and blue-violet light are called the additive primary colors because when you mix two of the three colors of light the resulting color is higher in key or value.
Red, blue, and yellow pigments are the subtractive primary colors because when you mix two of three pigments the resulting color is lower in key or value.
Basically, it's the difference between refracted light and reflected pigment.
DOUBLE EDIT: And any color light can be produced from the combination of the three additive primary colors; while any color pigment can be producued from the combination of three subtractive primary colors.
I'm exhausted. I need a nap.
Red-orange, green, and blue-violet light are called the additive primary colors because when you mix two of the three colors of light the resulting color is higher in key or value.
Red, blue, and yellow pigments are the subtractive primary colors because when you mix two of three pigments the resulting color is lower in key or value.
Basically, it's the difference between refracted light and reflected pigment.
DOUBLE EDIT: And any color light can be produced from the combination of the three additive primary colors; while any color pigment can be producued from the combination of three subtractive primary colors.
I'm exhausted. I need a nap.
Think of it this way:
When *creating* colored light, you can start with red, green, or blue light and create any color.
When *reflecting* white light (off the canvas of a painting, for instance) the pigments magenta, cyan, and yellow subract out the parts of white light that aren't wanted, to generate any color when the reflected light gets to your eye.
Make sense?
When *creating* colored light, you can start with red, green, or blue light and create any color.
When *reflecting* white light (off the canvas of a painting, for instance) the pigments magenta, cyan, and yellow subract out the parts of white light that aren't wanted, to generate any color when the reflected light gets to your eye.
Make sense?
First there is white light. When white light reflects off of something, the surface of that object absorbs a part of the spectrum of light and what bounces off is what we see as color. This is "subtractive color" because the object subtracts part of the spectrum to create the color and we refer to the light as "reflected" light because it bounces off the object before reaching the eye.
Projected light, like that coming from a monitor, doesn't reflect off of anything, so in order to create color we need to first break down the spectrum into simple wavelengths. We then start adding those simple wavelengths together is certain proportions to create different colors. This is "additive color".
Using a simple prism, we can see that white light breaks into a "rainbow" spectrum commonly seen as Red, Orange, Yellow, Green, Blue, Indigo, and Violet. The strongest, primary colors there are Red, Green, and blue. Most of the others are either secondary or tertiary colors we perceive that are a combination of the primaries. Some color theories put Violet in the primaries, but if I remember correctly it is so weak that it is hard to separate and project consistently. Red, green and blue work to create most of the gamut of colors.
For reflected (subtractive/ink) color, it gets much more complicated and there have been many color theories for what creates the best selection of pigments to combine to create the widest range of color. Most painters don't even think about primary colors, instead using as wide a range of different pigments as are available to them. Painters were painting long before the physics of light was understood. But as we learned the physics, we saw that certain pigments when combined would result in the reflected light creating primary projected light colors. So if you combine yellow and magenta, you get red. The three pigments that when variously combined at full strength to create the projected primaries are Cyan, Magenta, and Yellow. Percentage combinations of these three can be used to create nearly any color; however, the gamut of possible colors that these three can create is still smaller than what projected light can create simply because it isn't a perfect system. There are additional printing systems that would allow for the addition of orange and purple to the basic set of inks which allows for a much greater range of possible color reproduction (a bigger gamut).
So why Red, Blue, Yellow like you are taught in school? Because people like Blue and Red better than Cyan and Magenta and they are close enough that they can produce the colors that people understand easily.
Ultimately, these are referred to as "color theory" because there are several systems which can be used to describe or create color, and they all work on principles of wavelength physics.
Page on color
RGB world
Basic Principles
Projected light, like that coming from a monitor, doesn't reflect off of anything, so in order to create color we need to first break down the spectrum into simple wavelengths. We then start adding those simple wavelengths together is certain proportions to create different colors. This is "additive color".
Using a simple prism, we can see that white light breaks into a "rainbow" spectrum commonly seen as Red, Orange, Yellow, Green, Blue, Indigo, and Violet. The strongest, primary colors there are Red, Green, and blue. Most of the others are either secondary or tertiary colors we perceive that are a combination of the primaries. Some color theories put Violet in the primaries, but if I remember correctly it is so weak that it is hard to separate and project consistently. Red, green and blue work to create most of the gamut of colors.
For reflected (subtractive/ink) color, it gets much more complicated and there have been many color theories for what creates the best selection of pigments to combine to create the widest range of color. Most painters don't even think about primary colors, instead using as wide a range of different pigments as are available to them. Painters were painting long before the physics of light was understood. But as we learned the physics, we saw that certain pigments when combined would result in the reflected light creating primary projected light colors. So if you combine yellow and magenta, you get red. The three pigments that when variously combined at full strength to create the projected primaries are Cyan, Magenta, and Yellow. Percentage combinations of these three can be used to create nearly any color; however, the gamut of possible colors that these three can create is still smaller than what projected light can create simply because it isn't a perfect system. There are additional printing systems that would allow for the addition of orange and purple to the basic set of inks which allows for a much greater range of possible color reproduction (a bigger gamut).
So why Red, Blue, Yellow like you are taught in school? Because people like Blue and Red better than Cyan and Magenta and they are close enough that they can produce the colors that people understand easily.
Ultimately, these are referred to as "color theory" because there are several systems which can be used to describe or create color, and they all work on principles of wavelength physics.
Page on color
RGB world
Basic Principles
<< RGB are the additive primary colors; RBY are the subtractive primary colors.
EDIT: In other words, RGB is for mixing light; RBY is for mixing pigments. >>
Correct-o-mundo.... glad to see someone was paying attention in art class...
There are two seperate color wheels for light and pigment. My sis-in-law and I always get into arguments because I was trained in pigments and she's a photographer.... she's usually right :|
<< Just learned some seemingly useless information
Thanks >>
I have a background in painting, photography, commercial printing, graphic design, and Photoshop instructor. All of which have made me money, so I wouldn't call it entirely useless information.
<<
<< Just learned some seemingly useless information
Thanks >>
I have a background in painting, photography, commercial printing, graphic design, and Photoshop instructor. All of which have made me money, so I wouldn't call it entirely useless information.
>>Dont get me wrong, I had no intent of insulting you or anything. But to me it just seems like useless trivia, probably good to know none the less, never know when you'll need to know these kinda things
<< Dont get me wrong, I had no intent of insulting you or anything. But to me it just seems like useless trivia, probably good to know none the less, never know when you'll need to know these kinda things
>>No offense taken. Just pointing out that what is trivial to some can actually be useful in a real and practical sense. And working as a photographer wasn't all dry color theory. There were pretty naked people too.
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