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White pixels in RGB but not alpha

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Caleb Thomas
White pixels in RGB but not alpha
on Dec 9, 2009 at 5:47:48 pm

I have been exporting TGA sequences with alphas from after effects and when I open them in Photoshop I can see a strange white rim (usually) of pixels around my art. Sometimes it's just a tiny cluster of pixels too. They are not seen in the alpha though so I know they aren't really supposed to be there.

I have tried premultiply and straight alphas. I've also tested putting a black background behind the comp in AE and the garbage goes away but the alpha becomes a solid white.

This isn't really a huge problem but sometimes when the client sees white in the RGB they freak even though they know it's getting keyed out.

This is also just after effects footage from a comp. There are no external pieces of art other than photoshop comps.

Anyone know what it is?

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Chris Wright
Re: White pixels in RGB but not alpha
on Dec 9, 2009 at 5:58:53 pm

get back to us after you try a Tiff 32bpc, LZW off image. Then'll we'll know if it's a premult problem or something else...

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