for those in need, I did a complete tutorial on Exposure and Gamma Correction in Poser, Vue and Photoshop, starting at http://www.book.artbeeweb.nl/?p=317 

The why, how, tips, tricks, pitfalls and differences between the various programs.

have fun.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though