Premultiply with IBL

[ZippZopp]

i noticed this as well, whenever I use IBL, no matter what my cameras environment color is set to, my background is alway black. no idea if there is a way around this, does anyone know?
one thing i do to get around this is select the alpha in photoshop, fill it with black on a new layer. drop that underneath your render and set your render to i think linear dodge and it should get rid of the black matte edge. give it a shot

[Undseth]

You can assign a ray-shader to the "texture" slot of the IBL node and set the "eyerays" slider on the ray-shader to white, this way the background will turn white.

You need to switch the type option from "file" to "texture".

A hdri file may be assigned to the "finalgather" slot of the rayshader.

Ive seen at least two rayshaders on cgtalk, the one i tried just now is the "ctrl_rays" shader which is found somewhere on cgtalk.

When using final gather with multibounce, i think the eyeray color will somehow add to the fg shading and make things a bit brighter when the value of the white is set to 1, even brighter if value is set higher than 1.

Link to links (http://forums.cgsociety.org/showthread.php?t=338895&highlight=ctrl_rays)

[majorbludd]

Thank you both guys. Using ctrl_rays is such a good idea! I didn't think of that (obviously). I'll try it now.

[Ash-Man]

I"m not sure if this would be the answer to your problem

but you can Uncheck Premultiply
from render settings
under Primary framebuffer

---- EDIT-------
if you are trying to have IBL to sphere of ex and u want the background to be white
then
2 render layers ..cause the IBL is an enviroemnt node...
one layer over ride to file .. HDRI
the other override to be color white
and Uncheck the premultiply

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