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The number of color components for each pixel.
For example Grayscale images contain one component, RGB images
contain three and CMYK images contain four.
Referencing this property has a number of advantages over referencing
the PixMap.ColorSpace.Components
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 number
of components is implicit in the definition of the PixMap and needs
to be inferred by the PixMap itself.
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