The ColorSpaceType
for this image.
Referencing this property has a number of advantages over referencing
the PixMap.ColorSpace.ColorSpaceType property.
Firstly it avoids the possibility that a new ColorSpace object
will need to be created.
Secondly it takes account of the fact that certain types of PixMap
(e.g. ImageMasks) do not have a ColorSpace. In these cases the ColorSpaceType
is implicit in the definition of the PixMap and needs to be inferred
by the PixMap itself.
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