This class represents a color.
A color consists of an array of component values. For example an
RGB color has three values between zero and one, a CMYK color has
four between zero and one.
Colors only make sense in the context of a color space that
specifies what the components represent. Most components range
between zero and one.
However some color spaces such as Lab have components with
values outside this range.
This is definitively detailed in:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; page 139.