There are seven colours of light in imaging which are the colours of a rainbow red,orange,yellow,green, blue,indigo and violet,which when mixed together makes white. However our brain can pick out the RGB colours mostly which are red,green and blue. These three colours can reproduce a broad variety of colours when they are mixed. RGB colours are made for screen images.
There are up to 256 shades of each colour going from black to white.
The colours used for printing are CMYK which stands from: Cyan, Megenta, Yellow, and K-black. CMYK colours are used fro printing. It is made from four colours and is also used for describing the printing process.
Gamut warning on photoshop means the range of colours that a colour device can display or print out. A colour that is showed on you monitor in RGB might not be printable in gamut of your CMYK printer. For example the blue that comes on the monitor prints as a purple.
Amount of colurs that can be used = colours pace
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