|How to remove of the outer edges in mental ray images|
Software Used: Maya
This issue is most evident when rendering an image with an alpha channel and then trying to use it in a compositing application.
Here is a default mental ray render layered on a gray background in Photoshop:
The dark edging is due to the “Premultiply” option in mental ray found in the render settings window Quality tab > Framebuffer:
To remove this outer edge you can either:
A. In your compositing application, use the option to remove the outer edge. For example, in Photoshop you can do the following:
Layer > Matting > Remove Black Matte
B. or disable the Premultiply option before rendering with mental ray
Both methods will remove the undesired outer edge.