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"Dust" or something appearing in comp

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Martin Camenius
"Dust" or something appearing in comp
on Feb 17, 2012 at 10:06:49 am



Hey!

I'm stuck, I don't know what to do. I don't know why, but "dust"/small particles or what you might call them appears in my comp.
What I've done is that I've put a couple of copies of our business logo in a comp, and sort of put them under each other to create the illusion of 3D. With a camera and an adjustment layer I've made the logo "fly around" in the comp, but something is definitely messed up.

At first I used .eps-files but when I thought that that might be the problem I converted them to .psd, but that doesn't fix it. I've tried both CMYK and RGB.

I assume it has something to do with all the layers, but I've done "this kind of thing" before and it's never been like this before.

I would REALLY appreciate any and all help regarding this.


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Joseph W. Bourke
Re: "Dust" or something appearing in comp
on Feb 17, 2012 at 3:02:00 pm

It sounds to me like maybe a bad alpha channel. Is it possible that the logo was originally on a solid, then cut out to make the alpha in Photoshop, using the magic wand tool? If so, what very often happens is that the tolerance on the background color pick misses a bunch of pixels, resulting in the "dusty" look you're talking about. I hope that's it - otherwise, I've got nothing. A quick check to see if it's the alpha would be to put a mask around the logo as tight as you can get it, and see if the schmutz goes away.

Joe Bourke
Owner/Creative Director
Bourke Media
http://www.bourkemedia.com


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Martin Camenius
Re: "Dust" or something appearing in comp
on Feb 17, 2012 at 3:10:51 pm

Thanks for your reply, but unfortunately that isn't the case. It's a clean alpha channel... :/

I'll work around it and come up with something else, but would be great to know what it is for future reference.


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Mato Kokotic
Re: "Dust" or something appearing in comp
on Feb 17, 2012 at 9:59:35 pm

Do you have a light in precomp?



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Martin Camenius
Re: "Dust" or something appearing in comp
on Feb 20, 2012 at 7:56:54 am

No, no added light sources.


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