Quote - it would be nice if i i could in photoshop make a image and then tell poser that every white line should have a seperate specular.

That's why you don't use straight white.  You use a gradient of different shades from black to white.  Making a 2-color specular map is pretty self-defeating.

I've actually found that you get better specularity on hair when you use a shader rather than an image map based specularity in the Alternate Specular node, using the Anisotropic node.  A MUST is that your hair has a GOOD Bump map attached so differentiating between strands of hair is visible.

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