> I'm trying to render an image in segments, using +SR and +ER, but I'm getting
> banding.  Each 48-line segment has a different brightness.  Why?  Is this
> because I'm using radiosity?

Yes. I *always* get banding when using radiosity and tiled rendering.

You could render the whole image at a lower resolution, saving radiosity 
data, then load that saved file when rendering the tiles. But IME, even 
then I got some slight brightness difference.

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