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 Using mask to make part of Image transparent in After Effect 
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Joined: Mon Jul 23, 2012 6:24 am
Posts: 32
Post Using mask to make part of Image transparent in After Effect
I have a sequence in which I have processed twice, once for the sky and surrounding landscape and one for a building, due to the buildings lights needing a different colour balance. I know I can create a mask in photoshop and make part of the image opaque and the rest transparent so I can layer them over one another in after effects and thus use the relevant parts of each, but cannot remember for the life of me how to do this! Can anyone help! Cheers, Will.


Wed Dec 11, 2013 10:20 am
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Joined: Mon Jul 23, 2012 6:24 am
Posts: 32
Post Re: Using mask to make part of Image transparent in After Ef
I figured this one out myself - create a mask in photoshop with whatever you want to be seen in black and the rest in white. Save selection as an alpha channel. Load into AE and put into your comp. Then click on the layer you want to make transparent (eg the one below the mask) and go to Layer - Track Matte - Alpha Matte. Done.


Thu Dec 12, 2013 10:12 am
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Joined: Wed Apr 03, 2013 7:20 pm
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Location: Brisbane, Australia.
Post Re: Using mask to make part of Image transparent in After Ef
You can also lock clips / layers to a Parent so if you keyframe motion on the Parent clip, the others will follow.

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Thu Dec 12, 2013 2:20 pm
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Joined: Mon Jul 23, 2012 6:24 am
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Post Re: Using mask to make part of Image transparent in After Ef
Thanks Karl. What if the clip was shot using motion control. Can you recommend anything for that?


Fri Dec 13, 2013 12:38 am
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Joined: Mon Jul 23, 2012 6:24 am
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Post Re: Using mask to make part of Image transparent in After Ef
Also, I am doing multiple versions of the same sequence, for different parts of the image. Is there a way of doing this that doesnt involve having mutiple copies of the RAW files, eg just having different xmp data? 3 versions of one sequence means even more HD space taken up! Thanks, Will.


Fri Dec 13, 2013 3:24 am
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Joined: Wed Apr 03, 2013 7:20 pm
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Location: Brisbane, Australia.
Post Re: Using mask to make part of Image transparent in After Ef
Locking to a parent should work no matter what as long as the motion is the same.

For the different versions you could just edit once and move those XMP files to a new folder, repeat until you have all the different versions you need. Then just copy back the XMP files you need at the time.

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Sun Dec 15, 2013 3:06 pm
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Joined: Mon Jul 23, 2012 6:24 am
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Post Re: Using mask to make part of Image transparent in After Ef
Thanks, will try that. Should save a huge amount of memory.


Tue Dec 24, 2013 3:42 am
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