Export Alpha Channels as a stand-alone file

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It is currently not possible to export and save an alpha channel as a stand-alone file.  It would be great to have an alpha channel created in one file of a sequence to apply via an action to all photos of a sequence without having to keep the original file open while the action was running, or to use it in Adobe Premiere Pro or another application.  I can think of several other uses of such a capability.
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David Ferry

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Posted 1 month ago

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Warren Heaton

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Copy and paste from the Channels panel to the Layers panel and then save to whichever file format you would like to use for the stand-alone file.  While you can use PSD, I usually use File > Export > Quick Export as PNG.

For what it's worth, Premiere Pro and After Effects should be able to access the Alpha Channel as long as it's Channel 4 (Red Channel being Channel 1, Green Channel being Channel 2 and Blue Channel being Channel 3 and the 1st Alpha Channel being Channel 4).  



-Warren
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David Converse

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Split channels exports each channel to a new file.
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Warren Heaton

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And for part 1 of your request, use Select > Load Selection to apply the Alpha saved in one file to another file in Photoshop.  After loading the Alpha as a Selection, you can then save it in the current file.  You can record these steps as an Action.


(Edited)
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eartho, Champion

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This has been possible for more than 25 years... copy>new>paste>save
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David Ferry

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Eartho, thanks for your response, but that method is still a workaround.  You have to have a document open in the background that contains the alpha channel to use it in an action.  What I would like to see is an independent document that the action could open and use.
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Warren Heaton

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A better way to think of it is an independent document that the Action can open and then load the Alpha (which is actually any document - it just needs the Alpha Channel that the Action is loading otherwise you'll get an error.)
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David Converse

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I just told you. Split Channels.
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eartho, Champion

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David, ok so make an action which opens and loads that alpha... what's the problem here?
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Warren Heaton

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There're two parts the post:  One, loading the alpha and two, saving as its own file. 
At least, as best as I can tell.