colour/models

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1. CMYK - is short for Cyan, Magenta, Yellow and Key black. Used in lithography printing process.
2. RGB - short for Red, Green and Blue and is screen based as it has such a large gamut.
3. Greyscale - composed exclusively of shades of neutral grey. Can vary from black (weakest intensity) to white (the strongest).
4. Duotone - when you print with two inks. However, you can also use three or four colours.
This is known as tritone and quadtone, respectfully.
5. Spot colour - one or more specially mixed colours.
6. Monotone - to print with one colour. However you can use the stock as another colour.