Bloom shader makes it impossible to render black?

Posted by Mathias Lykkegaard Lorenzen on Game Development See other posts from Game Development or by Mathias Lykkegaard Lorenzen
Published on 2011-06-19T22:02:33Z Indexed on 2011/06/20 16:40 UTC
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XNA

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bloom

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glow

I am playing around with the bloom shader from the XNA sample page, to do some glow shading. I am rendering primitive vector-ish squares of linelists/linestrips, on a background. However, I am facing a few problems.

With a black background and white squares, I can actually see the squares. However, with a white background and black squares, I can't see them at all.

Why is this happening, and is there any way of me fixing it?

Can I modify my bloom shader to also "glow" dark elements, if that's what is causing it?

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