I think merleniau is pretty much correct. Regardless of hue, photos use the color cartridges to print. I believe the black cartridges are for when you select text only or something along those lines.
Of course, I could be completely wrong. I'm usually never right about these things.
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"I can normally tell how intelligent a man is by how stupid he thinks I am" - Cormac McCarthy, All The Pretty Horses
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