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I think in the particular instance of the purplish strands of coral, the outlining "is what it is". To do a smooth blended background requires a larger texture and/or larger alpha map. I'm not sure what Jim has said about this in the past. Generally Jim doesn't like to use any more than 1 or 4 shades of blending from what I have seen.
"Journalism is printing what someone else does not want printed. Everything else is public relations." - George Orwell
"If voting changed anything, they'd make it illegal." - Emma Goldman
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