ImageEffectOpaque Manual     Reference     Scripting  
Scripting > Attributes > ImageEffectOpaque
ImageEffectOpaque Inherits from Attribute

Any Image Effect with this attribute will be rendered after opaque geometry but before transparent geometry.

This allows for effects which extensively use the depth buffer (SSAO ect) to only affect opaque pixels. This Attribute can be used to reduce the amount of visual artifacts in a scene with post processing.