COLOUR TERMINOLOGY

Colour: the same as hue A specific color such as yellow or green;
CMYK: Short for Cyan-Magenta-Yellow-Black, and pronounced as separate letters. CMYK is a color model in which all colors are described as a mixture of these four process colours. CMYK is the standard color model used in offset printing for full-color documents. Because such printing uses inks of these four basic colors, it is often called four-color printing;
RGB: display devices generally use a different color model called RGB, which stands for Red-Green-Blue. One of the most difficult aspects of desktop publishing in color is colour matching - properly converting the RGB colors into CMYK colors so that what gets printed looks the same as what appears on the monitor
Colour separation: (printing) the division of a coloured original into cyan, magenta, yellow and black, so that plates may be made for print reproduction. Separation may be achieved by electronic scanning or by photographic techniques using filters to isolate each colour;
Process Colour Printing: the subtractive primaries: yellow, magenta, cyan and black are used to achieve full color reproduction;
Spot Colour Printing: specific ink colors are specified in this method from the Pantone© Matching System of inks. Black is one spot color;
Ink: coloured liquid used for writing, printing or drawing;
Chroma: the purity, saturation or intensity of a hue;
Tint: Hue mixed with white;
Tone: Hue mixed with grey;
Shade: Hue mixed with black;
Value: The extent to which a colour reflects or absorbs light. A measure of the amount of light reflected from a hue. Those hues with high content of white have a higher luminance or value;
Intensity: the brightness or dulness of a hue. One may lower the intensity by adding white or black;
Saturation: The degree of purity of a hue;
Primary colours: in paints, red, blue and yellow, or more currently, magenta, cyan and yellow;
Secondary colours - the result of mixing 2 primary colours.