There are two types of color models, those that are
subtractive and those that are additive.The the two most common colour modes used for computer graphics are the RGB
model (Red-Green-Blue) for computer display and the
CMYK model (Cyan-Magenta-Yellow-blacK) for printing.
Colors in the RGB model are much
brighter than the colors in the CMYK model, the visbale spectrum of colours is alot greated on screen in RGB mode than what can be printed with CMYK. The chart above shows the visable spectrum for the different colour modes.
The range of colour that can be seen in each colour mode is called gamut, thats why when working on screen you make sure your in the right colour mode for what your doing, if you wish to eventually print your work you need to chnage your colour mode to CMYK so you can see the visable gamut it can print.
'The CMYK printing method is also known as "four-color
process" or simply "process" color. All
of the colors in the printable portion of the color
spectrum can be achieved by overlapping "tints"
of cyan, magenta, yellow and black inks. A tint is a
screen of tiny dots appearing as a percentage of a solid
color. When various tints of the four colors are printed
in overlapping patterns it gives the illusion of continuous
tones.
The tiny dots that make up the solid colour can be seen here:
Here is a video explaining the differences between RGB and CMYK.
Another good video explaining about CMYK printing.
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