Fuzzy box darkens the edges blur alpha in After Effects

Hello

As part of a filter more complex, I created a box simple fuzzy graphic Pixel Bender which simply blurs the pixels of a whole amount. It is divided into horizontal and vertical then treatment for speed (essentially it is substantially the same as the blurry box part of the example given in the Pixel Bender Developer's Guide).

I use to blur an image with an alpha channel.

The Toolbox it works absolutely fine, however when I use it in After Effects CS5 the fuzzy edges look dark, as if the filter is assuming that the fuzzy alpha background is black. In the Toolbox, if I set the preferences-> picture Window-> background color to white, it works as expected, but it's because the Toolbox knows the color is white and unpremults accordingly. I tried premultiplying the pixels of the alpha to see if it works, but it makes it just worse!

Any suggestions on how to fix this would be appreciated!

Thank you, Christian

Yes, After Effects is multiplier pre with Alpha. That's usually what you want to do a convolution, but in your case the UN-prémultiplier would be correct.

Tags: Pixel Bender

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