Although there may be an infinite number of color systems, they are not all equally useful, practical, or effective. For instance, I am free to create a color system where I define light blue, medium blue, and violet as my primary colors. Even though I am free to define my primary colors as such, this color system is not very useful in general because no amount of mixing of these primary colors will produce red, orange, yellow, etc. Therefore, we should make a distinction between a color system and an effective color system.
The effectiveness of a color system is best measured as the number of different colors that can be created by mixing the primary colors of the system. This set of colors is called the "color gamut" of the system.
A color system with a large gamut is more able to effectively represent a wide variety of images containing different colors. The most effective color systems are those that closely match the physical workings of the human eye, since it is ultimately the human eye which experiences the color. The human eye contains a curved array of light-sensing cells shaped like little cones and rods. Colored light is detected by the cone cells.
The cone cells come in three varieties: red-detecting, green-detecting, and blue-detecting. They are so named because the red cone cells mostly detect red light, the green cone cells mostly detect green light, and the blue cone cells mostly detect blue light. Note that even though a red cone cell predominantly detects the color red, it can also detect a little bit of some other colors. Therefore, even though humans do not have yellow cone cells, we can still see yellow light when it triggers a red cone cell and a green cone cell.
In this way, humans have a built-in color decoding mechanism which enables us to experience millions of colors, although we only have vision cells that predominantly see red, green, and blue.
The Straight Dope homepage. Filed under:. If blue, red, and yellow are primary colors, why do color TVs use blue, red, and green? By Cecil Adams Jul 26, Share this story Share this on Facebook Share this on Twitter Share All sharing options Share All sharing options for: If blue, red, and yellow are primary colors, why do color TVs use blue, red, and green? Reddit Pocket Flipboard Email.
Dear Cecil: As kids we were taught in art class that the primary colors were red, blue, and yellow. Why is it called a restroom, anyway?
How did public libraries get started? Thanks for signing up! Check your inbox for a welcome email. Email required. By signing up, you agree to our Privacy Notice and European users agree to the data transfer policy. Share this story Twitter Facebook. If it is not, then the color could be worse. The real test, of course, is whether the human eye likes what it sees.
At the CES show, Sharp had a QuadPixel display set up next to an RGB model, cycling through the same images simultaneously for comparison, and the difference was discernable to this reporter's eye. Yellows definitely seemed to be more saturated. The downside: Sometimes the overly saturated yellows almost made the image look cartoonish. Other colors, meanwhile, didn't seem that much better nor even brighter.
Some of the other CES attendees who stopped by the Sharp booth were also underwhelmed. The majority of reactions were similar: Yeah, the yellows look yellower, but it's not earth-shattering. So what? There are two types of primary colors: additive , and subtractive.
Subtractive primaries are what you find with fingerpaints, tie-dyes and, well, any other paints and dyes. As any school kid knows, these primary colors are red, yellow and blue. Modern color theory and what's used in printing and elsewhere that requires subtractive color , shows that magenta, yellow and cyan are the best colors to use in a subtractive color setup.
Go into any magazine's art department if you can find any , and they'll be using CMYK the "K" stands for for Key, which in this case means black. We don't really care about subtractive color, since this is a tech website -- albeit one that publishes a print magazine -- and you are viewing it on a display that uses additive colors. Additive colors are the blending of actual light, where subtractive is the adding of pigments to subtract absorb all the wavelengths of light except the color you see add vs subtract!
Additive color primaries are red, green and blue. I bring all this up because every time I write "primary colors" and RGB in the same sentence, someone tries to mansplain that "everyone" knows the primary colors are red, yellow and blue.
At least, not in this context. Blending light is important, because it's how every color TV, monitor or screen you've ever seen creates colors beyond red, green and blue. Add red and green together, you get yellow. Add green and blue together, you get cyan. Added blue and red together, you get magenta. Add different amounts, and you get different shades. As I'm sure you've keenly noticed, blending primary colors together creates "secondary colors," and the secondary additive colors are the primary colors of subtractive color and vice versa.
I love it when things are so simply symmetrical. The scientific answer is a specific wavelength of light we call those colors. But the vagaries of the term are something best fixed with a Pantone vocabulary. For example, if I ask you to think of something "red" do you think of the red of an apple or the red of a fire truck.
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