Colour wheel – Oki 8c Plus User Manual
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OKIPAGE 8c Plus
Colour wheel
The relationship between colours can be best shown on what is
known as a colour wheel. The hue value of a particular colour is
expressed in degrees. Red for example is at 0° and green and
blue are located at 120° and 240° respectively. The subtractive
primaries, yellow, cyan and magenta are located at mid points
between these.
The colour wheel shows the following relationships:
•
the additive primaries are displaced by 120° from each other.
•
the subtractive primaries are displaced by 120° from each other.
•
each colour is a secondary colour of the two colours either side of
it. For example, mixing equal quantities of yellow and magenta
will produce red.
•
a colour is directly opposite its complement.
We can continue to mix neighbouring colours on the colour
wheel to produce further, intermediate colours. The number
of colours on the colour wheel now doubles to twelve (as shown
below). Repeating the procedure a number of times produces a
colour wheel with subtle changes of hue from neighbour to
neighbour.
Colour Wheel
showing RGB (circles), CMY (squares)
and their first set of intermediate colours.