premultiplication and renderpasses [img]

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Old 08 August 2009   #1
premultiplication and renderpasses [img]

Okay, I've had trouble in the past with premultiplication. I though it was great as I had full RGB and clean alpha. I had some problems with SSS and premultiplication during the year, posted here, and got warnings from Djx/masterzap if I remember, but did not listen.

Here's my problem (the spots in all my passes);


(simple mia+fg on 2009)

Is it generally a bad idea to use premultiplication then, and why is it there?

Why do these spots appear ? (I've fiddled with clipping/buffer properties to no avail)

Thank you for your input.

Bernie
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Last edited by berniebernie : 08 August 2009 at 05:02 PM.
 
Old 08 August 2009   #2
Although this doesnt look great here, how does it look once you've multiplied your alpha in comp?

If you do a mult div in comp with the pre-multed image, does it look like your rendered version?

Last edited by ndeboar : 08 August 2009 at 04:57 PM.
 
Old 08 August 2009   #3
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