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?
TIA
Ben
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