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• A limited number of colours plus shades of those colours. Shades are
created by adding white or using different colour patterns.
• A limited number of colours plus custom colours. For example,
mixing red and blue for purple.
Matching Colours displayed on your monitor with
printouts
Colours are displayed on a video monitor by mixing the colours red,
green, and blue (the three primary colours of visible light) in the
amounts required to produce any given colour. This sort of display
technology is called RGB. In the RGB method, the more intense the
colours you mix, the brighter the colour becomes.
RGB method CMYK method
Printing technologies, on the other hand, employ the three primary
colours cyan, magenta, and yellow, plus black (or K) to produce colour
effects. This method is called CMYK. In the CMYK method, the more
of a given colour you add to a mixture of colours, the darker the
resultant colour becomes.
As these paragraphs illustrate, the methods used to produce colour in
displays and printers are completely different. Other factors that can
affect the perception of colour are the quality of paper, type of print
media, and differences in the source of light in use when viewing the
colours. For these reasons, it is impossible to avoid some differences in
the perceived colour of a document or image viewed on a monitor, and
the same image in printed form. In order to achieve a printed result
which looks like the image displayed on the screen of a monitor, you
must first make the appropriate settings to both the software application
and the printer.
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Chapter 5 Colour Printing and Black-and-White Printing
5
Red
Green
Blue Magenta
Yellow
Cyan