Reread my "help" only after posting that reply and saw I left out anything 
about the 2/3 index values found in the pigment_map...! Early morning for 
me, sorry.

I chose two-thirds so that the remaining one-third is the brightest parts of 
the image and would be the only places blended into the original image.

While I'm here again I might as well emphasize the fact that I hadn't even 
used an actual premade scene file to test this effect yet. I have no idea if 
it really looks okay. I'm not 100% positive it works as expected so you'll 
probably know how it really looks before I will.

Bob

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