23
votes
Accepted
Why do red, green, and blue make up all the colors?
Let's reminds ourselves what light is.
Radio waves, micro waves, X rays and gamma rays are all electromagnetic radiation and they only differ by their frequency. It just so happens that the human eye ...
- 4,380
20
votes
Why do red, green, and blue make up all the colors?
They don't.
The problem with the diagrams representing the visible and RGB gamuts is that they're presented on RGB displays. They obviously cannot show you what they cannot show you : the area inside ...
- 301
17
votes
Why do red, green, and blue make up all the colors?
Humans are trichromatic, which means we have 3 different kinds of color receptors (better known as cone cells), each sensitive to a different set of wavelengths:
Image source: wikipedia
So it only ...
- 5,920
4
votes
Why do red, green, and blue make up all the colors?
They don't. Aside from what others have said about the physical reasons not, from a practical computer graphics standpoint, representing either surface pigments or light sources with RGB color is ...
4
votes
Why do red, green, and blue make up all the colors?
One more thing: "violet" and "purple" are not the same color. Violet is a pure color around 400 nm; but purple is a combination of red and blue. To our not-quite-perfect human eyes they look the ...
- 141
3
votes
Accepted
splitting hue & saturating and leaving value behind
Removing hue and saturation ("desaturating") leads to a grayscale image with the same luminance as the original colors, for instance:
(source: my own photo)
It is not possible to remove hue ...
- 24.7k
2
votes
Mixing HSV Channel
I think your answer is a little off. When the saturation is 0, the hue is basically undefined. It has some numerical value, but that value is ignored. Saturation of 0 means achromatic, or uncolored. ...
- 3,401
1
vote
What is this vertical line contour effect in glitch art called?
The technique is called halftone. Achieving continuity must be done through subsampling / super-sampling, but the essence of the algorithm goes like this.
Imagine walking across a horizontal line of ...
- 410
1
vote
Accepted
Javascript color extraction library
In the end I decided to use Leon Sorokin's RGBQuant.js for quantization, because it offered better flexibility over the color histogram/clustering method. I'm probably going to convert the quantized ...
- 423
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