The funny thing is, from Poser 5 onward the standard desaturated/inverted bump map is totally unnecessary. It only takes up texture memory.

Drag a line from the texture map node output to an empty space in the material room. Choose node type Math->Math functions.
Choose function type Add (the default), set the upper value to -1 and the lower value to 1. Click on the eye icon, and you'll have your inverted grayscale map. Now connect the output of this node to the Bump channel, set an appropriate bump value, and you're done.

With a texture of 4000x4000 pixels this will save you a LOT of memory when rendering - don't forget that a texture map will be uncompressed in memory!

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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