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original file http://www.macphoto.net/photokey/1108-bme-0014.jpg Subject was about 4 to 5 feet from the background, which was lit to one f stop below subject to prevent green light bouncing onto subject.
with different settings
http://www.macphoto.net/photokey/1108-bme-0014-44d16l17t.jpg (44 detail 16 level 17 threshold) This gives me good extraction of the background, but a halo around the subject
http://www.macphoto.net/photokey/1108-bme-0014-29d63l41t.jpg (29 detail, 63 level, 41 threshold) This gives me poor extraction of the background, but a clean edge.
I've tried playing around with spill suppression, but it doesn't help. Setting colour to automatic or green doesn't make any difference.
Any suggestions on how to get a better extraction?