Color
Computer graphics, by their very definition, are a visual medium and as such rely on color to be seen. A color space is the range of colors that can be generated from the primary colors of a device. For example, imagine you are creating an oil painting. Say you had a tube of red, a tube of yellow, and a tube of blue, and you mixed them together in every conceivable ratio, then all the resulting colors would be the color space for that set of three tubes. If your friend did the same thing with slightly different reds, yellows, and blues, they would produce another color set unique to them. If you both mixed a green from equal parts of your own blue and yellow, you would get green that was 50% blue and 50% yellow, but because you both started with slightly different versions of blue and yellow, the resulting greens would be different.
The same applies to computer screens, printers, cameras, and anything else with a colored screen or print. The color you consider green on one...