My renderings saved with alpha channel come out with some dark lines around the edges. I found the following in documentation.
Distance and Materials channels are not anti-aliased and may show some hard-edged artifacts. Adding a small amount of Gaussian blur to a mask before using it may help soften these edges.
I was able to export the material and distance masks from Image Editor and use Gaussian blur in another program. Is there a way to re-import these blurred masks back into nxt Image Editor so they replace the original masks? Or can this only be done in Photoshop, etc.?