Blurry backgrounds

[Bob Snyder]

Henk Boom wrote:
> Okay, I've engineered a more pointed example, with a magnified portion
> to make it clearer. This background is simply a checkerboard pattern
> with light and dark colours (might be hard on the eyes for some, so I
> made it a small image). The left portion of the shot shows the
> background that is rendered, while the right shows the image in an
> image editor. The black-bordered box is a blown up portion of the
> image, clearly showing that the colours are bleeding into each other
> in the background.

I've attempted to re-create your problem, and don't see any blurring at 
all. However your image could be explained if you have the background 
image brightness set well below 0. When I set it to -100 I see a similar 
effect, that is the image appears 'muddy' and grey (but still sharp).

Bob s.