Colour
in OpenGL is typically represented as RGB.
RGB
is a colour space
- Red axis, green axis, blue axis
- Values typically in the range from 0.0
(none) to 1.0 (full colour) along each axis
- Point in the colour space can be
expressed as a vector

Source: Wikipedia RGB uses additive
colour mixing, because it describes what kind of
light needs
to be
emitted to
produce a given colour. Light is added together to create form from out of the
darkness.
