Effects spill outside the boundries of my masks? Why? at DVinfo.net

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Old September 19th, 2006, 06:07 PM   #1
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Effects spill outside the boundries of my masks? Why?

I have a video clip on the timeline that is scaled down to a 50% size and I have used a mask to crop down a certain area of the video. When I apply an effect the video the effect is applied to the entire video and will not stay with in the mask area only. In other words, I want the effect only to affect within the masked off part of the footage and not spill outside the mask. This seems like an error in the program to me.
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Old September 19th, 2006, 06:49 PM   #2
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Try adding the effect first then the mask.
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Old September 19th, 2006, 07:21 PM   #3
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I tried this but still the same error? It will crop the video fine but not the effect appleid to the video.
I am having to render the effect on the video on another timeline and then reload the file with the new video footage with the effect renderd to it.
This is a timely workaround and unsatisfactory.
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Old September 23rd, 2006, 09:41 AM   #4
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I'm assuming you use After Effects, if not, ignore:

Unfortunately, masks and effects don't react to one another in order of application. The look you achieve also depends on the effect you use.

A simple way to get it done most of the time would be to use a masked or small adjustment layer (mask if you want complex shapes or small if you just want a square) over the layer you want to affect. Usually works

Alternatively, instead of rendering the video out then re-importing, try nesting the comp, in comp 1 add the effect to the layer. put comp 1 into comp 2, then apply the mask.
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Old September 23rd, 2006, 02:13 PM   #5
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ooohh, That would work. I should have thought of that. I do the same thing in Premiere pro all the time but not in AFX.

And an Adjustment layer might work. I have never really used an Adjustment layer casue I didnt know what they did.

Thanks Conor. I had been waiting a week for a new idea.
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Old September 24th, 2006, 04:56 AM   #6
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No probs, sorry it took so long.
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