alpha

[Peterson Trethewey]

Is it possible to give an image an alpha channel? 
What's the best way to do it?  I've tried fooling with
the alphaData property but it doesn't seem to want to
change from its default state, and I've tried making
an image with an alpha channel and importing it.  Has
this worked for anybody?  I feel like I'm missing
something obvious.

Thanks,
Peterson

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