[PyMOL] load_png doesn't support alpha (transparency)?

Hi all,

I noticed today that when reading a png file using load_png, the alpha
channel does not appear to be respected (regions of the png that should be
transparent are not transparent but show up as white).

Does anyone know if this by design, a bug, or something I'm doing
incorrectly setting my alpha channel in the png file?

If you're wondering why I'm trying to do this; I'm attempting to generate
two aligned figures from models that are in crystallographic origins.  The
end goal is to have maps in each of these figures also aligned for
comparison, so I can't just transform the models to get them aligned (use
of the align command is out for similar reasons; unless there's a way to
get the transformation matrix generated by model alignment and apply it to
a map that I'm not aware of).

Thanks,

Pete

Pete Meyer
Fu Lab
BMCB grad student
Cornell University