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Alpha Trouble

Posted: Wed, 30th Jul 2008, 2:56am

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Black Ink Productions

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I have footage that i downloaded from detonation films, it is pre keyed footage, and i was wondering if it would work in efx lab?
Posted: Wed, 30th Jul 2008, 3:15am

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FXhomer46784

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Absolutely
Posted: Thu, 31st Jul 2008, 2:38am

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Black Ink Productions

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i still need help on this
Posted: Thu, 31st Jul 2008, 3:23am

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Axeman

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What do you need help with?
Posted: Thu, 31st Jul 2008, 5:16am

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Black Ink Productions

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the footage that i downloaded, it was of an explosion, is pre-keyed footage.

when i import it, it isnt, it is just video, and yet when i play it in quicktime, it is the explosion against black, not the grey and white squares
Posted: Thu, 31st Jul 2008, 2:24pm

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Axeman

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Then its not pre-keyed. If the footage contains an alpha channel, it will automatically be detected by EffectsLab. What codec is the footage in?
Posted: Thu, 31st Jul 2008, 9:02pm

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Black Ink Productions

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it is very much prekeyed, i got it from detonation films, the format is png, but it is a quicktime movie.

http://www.detonationfilms.com/PreKeyedExplosions.html

it is the first one on the page.
Posted: Fri, 1st Aug 2008, 1:46am

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Plainly

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Black Ink Productions wrote:

it is the explosion against black, not the grey and white squares
Then it's perfectly keyed! When you play/view files that have an alpha channel, it's going to appear as either black or white, depending on your computer.

If you put the video on your canvas in EffectsLab and the background is still black, try changing your canvas colour or put another video/image behind it.

Plainly
Posted: Fri, 1st Aug 2008, 2:34am

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Axeman

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I downloaded the clip in question, imported it to EffectsLab, and it does indeed seem to be already keyed. I dropped it on top of a video layer, and there was no black background. Have you tried compositing the clip yet, and the black covered your other video? If so, maybe you want to re-download the clip. If not, then the black you were seeing is probably the canvas color, as Plainly suggests.
Posted: Fri, 1st Aug 2008, 2:15pm

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Black Ink Productions

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i was able to get it to work...

but it is in screen mode, which completely destroyes the entire purpose of the clip!
Posted: Fri, 1st Aug 2008, 2:21pm

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Axeman

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Yeah, I noticed that as well, and I'm not sure what's up with that. I thought if there was an alpha channel present, it defaults to normal, but its not even giving the option. I don't know why.
Posted: Fri, 1st Aug 2008, 3:39pm

Post 12 of 16

Black Ink Productions

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yea.

so i guess NO prekeyed footage works with effectslab
Posted: Fri, 1st Aug 2008, 6:46pm

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Axeman

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It seems to be an issue with the codec. Out of curiosity I converted the video to the Quicktime Animation codec and imported it, and it keyed as it should, using the 'Normal' composite mode. Their key is still pretty awful though, with huge jaggies going on around the edges.
Posted: Sat, 2nd Aug 2008, 1:07am

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Black Ink Productions

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and how do you do this...

do you render it in effectslab to this codec
Posted: Sat, 2nd Aug 2008, 2:36am

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Axeman

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I used Quicktime Pro to convert it. Theoretically you could use EffectsLab, but I'n not sure how well it would work in practice.
Posted: Sat, 2nd Aug 2008, 3:21am

Post 16 of 16

Black Ink Productions

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yea

i just exported it using animation

and it works pretty well, i didnt see that many jaggies, but it idi have a matte line around it tho sad