Maya - models render out with a grey outline

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Old 02 February 2014   #1
Maya - models render out with a grey outline

Hi all,

I need some help. This has been plaguing me for yeeeears. And I'm fairly sure there's a blindingly obvious solution to which I'm, well, blind. Whenever I render an image in Maya that contains an alpha channel it produces a grey outline around the object. And when you try to comp it on a light background it stands out fairly obviously. I'm not sure whether it's an anti-aliasing issue or a transparency one. I've played around with render settings , but nothing seems to make a difference. I'm afraid rendering simply isn't my forte. And I've spent years telling clients "it's supposed to look like that" ;p - so please, any help would be massively appreciated ....

Regards
K

ps - i've attached a rendered image, I hope it shows up
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File Type: jpg test_shield1.jpg (69.8 KB, 9 views)
 
Old 02 February 2014   #2
Its called premultiplication.

The alpha channel is mulitiplied against the render to remove the fringe.

Color correcting the image can reintroduce the fringe, so what is normally done is un-premultiply the render first, color correct, and then premultiply afterwards.
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Old 02 February 2014   #3
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Old 02 February 2014   #4
Thank you!

Aaaah, finally the universe makes sense - well ok, at least my rendering issues do now. Thanks so much, you were a fantastic help!
 
Old 02 February 2014   #5
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