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Inverse Keying…Is it Possible??
OK, I have some idea how to key out a background but after having searched the net and the cow for some time, I can find nothing about how to “inverse key”.
Scenario: I have a one coloured object against a multicoloured background.
Objective: To key out everything but the foreground object
Question: Is there a simple keying method that will allow me to select the one foreground colour and remove everything else? (I have defined this as “inverse keying”, if there is a more correct term please let me know)
Note: In the past I have had to select out all the other background colours and key them out separately and this seems needlessly finicky
PS Much thanx to the AE gods and this forum, you are an inspiration. Just thought it should be said…….again 🙂
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4 Replies
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It’s pretty easy. Just key out the color you’d like, then duplicate the layer in the timeline. Of the two layers, check the box on the top layer to make it a track matte. Then, remove the keying effect from the bottom layer and set the layer’s track matte as the second selection from the drop-down menu, “Alpha Inverted”.
I think that’s the easiest way, although you might just be able to invert the layer’s alpha channel. I use track mattes all the time. I’m using them all over the place in a project I’m working on right now.
Jon
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There are many ways to accomplish this. The easiest is to apply this effect after the key(s)layer: effect/channel/invert/ select alpha from channel dropdown.
Or… you could create a track matte that selects inverse alpha….. copy an “unkeyed” layer of the source footage, place below keyed layer,
selcet trackmatte, alpha inverted. -
that was cool, we came up with the same solutions at the same time
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Thanks guys,
I knew that there must be a way of doing this, I just imagined that it would be even easier, like checking a box to invert or to use one of the special keying functions. What you guys have outlined makes perfect sense and I now think I should have been able to figure it out. D’oh. Thanx for info. Much appreciated.
DD
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