Hard to tell, based on the information provided. Could be a specular map, gloss map, curvature map, diffuse map, etc.
I can't quite tell, but it doesn't look entirely greyscale-- if indeed it isn't entirely greyscale, that would narrow it down to specular or diffuse, I would think.
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I can't quite tell, but it doesn't look entirely greyscale-- if indeed it isn't entirely greyscale, that would narrow it down to specular or diffuse, I would think.