i am trying to build an idea across multiple layers and i would like to be able to accumulate all of the alpha channels for all layers into a single mask. having access to the alpha channel in image ops like fixed image would allow me to do that. i also tried set selection to canvas alpha but it seems like canvas only registers the alpha of the current layer so using 'canvas to source' etc. only copies the current layer state. i'm looking for a way to accumulate all layers and i kind find a way.
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You could use another layer to do it (accumulate the alpha channels from different layers).
Turn on layer playback for the PASeq.
And you'd have to use the selection buffer as an intermediate buffer since you can't arbitrarily use other layer's alpha channels as Ip Source options.
So you goto each layer you want alpha from, use Current Layer Alpha as the Ip Source, and then route the output to the selection.
Then change to the alpha accumulation layer.
Use the Region Selection as the Ip Source. Composite appropriately into that layer.
Repeat for all of the layers you want the alpha from.