This may not be what you are after by why not just create a mask from the channel? That will be locked to your layer and will resize/move with the object. You can reload the channel any time by ctrl clicking the mask.
Hum, I guess that might work, but I would really like to lock or parent that alpha channel so that it would move and scale with all changes made to the character, so that upon importation into another application like After Effects it would still match.
Suggestions?
The layer mask tool is the best option for this I think. When exporting to after effects or other adobe products, the transparency will be retained as an alpha channel in the imported image.
If the layer with the layer mask is the only one visible, you will in effect be editing the alpha channel when editing the layer mask.
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