I want to compose an image using a bunch of LC objects, then export a PNG, with an alpha channel containing a mask (ideally > 1 bit, but that part's not critical).

The documentation for export snapshot is not very clear. I've tried things like exporting a transparent group containing some objects; the PNG was just filled with black where there were no objects.

There is an option "with mask xx", but it appears that this is only for PBM format - and in any case I can't make it work.

Is there any way to do this?



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