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transparency problem


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It's probably showing straight alpha instead of premultiplied which is what most users are accustomed to seeing. I'm guess the edges are all aliased looking and rough and the colors are too intense. Don't use PNG, TIFF, or any other image format with integer values. Use OpenEXR which is linear and floating point (and it will look right in Image Viewer).

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I think there could be two possible problems in After Effects, even after you render them as OpenEXR (current best practice)

 

1. Alpha channel interpretation. See for example: http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7f7ea.html

 

2. Linear colors interpretation, See for example: http://www.3dtotal.com/index_tutorial_detailed.php?id=1552&catDisplay=1&roPos=1&page=4#.VNwdRyxJ1GY

 

When you render from Mantra the default is pre-multiplied alpha, linear color values.

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