The base color space is relevant for cases in which the ColorSpaceType property is Indexed.
An Indexed color space contains a palette of colors indexed by
number. Each item in the palette is a color in a different color
space. As such the Indexed color space has a base color space in
which the palette colors are defined.
This property allows you to determine the base color space for
an Indexed color space. If the color space is not Indexed then this
property is equal to the ColorSpaceType property.