I kinda skipped over the fact that the background also changed... if you only want to affect the character(s) in the scene, then you can use the alpha channel of the .tif file to create either a mask or a selection for cut/paste and just add new layers with the character(s) only. Anyway, I pretty much do these steps on every image I create, but sometimes set the opacity differently for the duplicated layers, depending on the lighting and affect I'm looking for. You can also play with other blending modes (overlay, multiply, etc) for additional affects.

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