Thanks for the tip :) sometimes I have to do this as well, because I go to preapre the shadows and dark areas on the images self.. if they are to dark and have to much contrast you will get the strange dark shadows that are not for edit in Photoshop ;) I figured out that the creators of the IBL AO did the light setting not really in the best way.. they forgot something between.. but for now it is my little sweet secret ;) ( I have to make another tests before I explain)

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"Surrender to what it is - Let go of what was - Have faith in what will be "