It's an interesting technique but - as I'm sure BB would say, it's wrong. You're creating a spec map and a bump map based on the brightness/hue of the diffuse, which isn't how either of 'em work. Sure, it gives you a pair of maps but they are still wrong. Bear in mind also, that the maps you create this way are entirely dependent on any baked in highlights in the diffuse map, which is completely ridiculous.

Looking at the maps produced above, what earthly reason is there for the wildly different bump values across the skin? There's nothing I can see that relates to a real world example of skin. Likewise, the specular; why on earth would the upper torso and the tops of the feet have greater specularity than anything else?

Sorry to pee on your cornflakes but it's just plain daft.

Coppula eam se non posit acceptera jocularum.

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