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Do you want to get a dark halo effect as on HDRI images?
– slawekApr 16 '14 at 22:59
Do you have any examples you can show us of what you are trying to achieve?
– YiselaApr 16 '14 at 23:05
The effect you are looking for might be called "vignette". Search for that and see if it helps. If not, show us some screenshots of what you want to achieve.
– bentehApr 17 '14 at 0:11
1
I think this is about a blurring operation, when applied to pixels on e.g. the left-hand edge of the canvas, having an effect on the pixels on the right hand edge of the canvas. HDRI maps would normally be wrapped into a sphere or hemisphere, so this might be required to prevent causing a visible 'seam'.
– e100Apr 17 '14 at 16:32