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Hi rdphotos....
I am not an expert but I think that the issue here is not the post processing, you need to plan ahead before you even take the shoot, the post processing is supposed to enhance the image, not to fix problems with the image, specially lighting problems.
For a shot like this you need to get the subject much further from the background so the light that you use to blow the background is not spilled into the subject.
The best method I've seen to do this is to have one or preferable two lights pointing at the background... totally separated of any influence of the subjects lighting, and then light your subject with its own set of lights. I don't know if I make any sense.
Try these, set your lights and turn off the speedlights/strobe that light the subject and just leave on the ones that light the background.... take a shot of it..... the subject should be shown as silhouette only (or almost), that will tell you that the background light is not contributing in the subjects lighting, which is they way it is supposed to be.... then turn the background lights off and just leave the subjects lights on..... that should give you an almos black background with your subject well lit...... now turn everything on and the shoot should be a well lit subject with a perfect white background.
Also, when you light the background, don't overexpose it, because the extra light bounced from it to your lens will cause ghosting and loose detail on the subject.
Like I said, I am not expert, but this is what I've been reading and been experimenting with and it seems to work.
Good luck.
Edited on Jul 25, 2014 at 12:32 PM · View previous versions
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