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choking a matte layer
Hi guys,
I have a black and white layer which i am using as a luma matte…
the problem is that there’s a bit of the background showing through so i would like to choke the matte a little bit; ie eat into the white area a little with 2-3 black pixels…
but because this is a luma matte the simple choke doesnt work – it only works on alpha areas…
can anyone help? 🙁
thanks in advance
Elin
It’s all the those pesky details :p
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3 Replies
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I don’t have AE in front of me right at this moment so forgive me if this doesn’t work:
You could try pre-composing the layer and it’s luma matte and apply a matte choke to the new pre-comped layer.
Samuel Hall
DP/Editor/VFX/Music
http://www.vimeo.com/samhall -
You can apply a Channels > Set Matte effect to the black/white matte and set it to use it’s own luminance as a matte, then apply the Matte > Simple Choker effect and use this layer as an alpha matte.
The alternative is using Channels > Minimax applied to the black/white matte set to a Minimum operation with a radius of 1 or 2. However, if there are subtle details in the black/white matte then this can end up chunkifying those.
These two different methods will have two different results, so try ’em both and see which works better.
Darby Edelen
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Darby – your first solution worked fine – but thanks guys, all interesting techniques…
Elin
It’s all the those pesky details :p
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