Wrong.  Alpha channels can be greyscale.  Don't know how Poser reacts to that - but it is not incorrect to use greyscale images for alpha maps in other applications.  If I misinterpret, I make a clear distinction between B&W (0 and 1 only on 'brightness) and greyscale (any monochromatic change in brightness between 0 and 1).

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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