On Tue, Sep 9, 2008 at 12:40 AM, David Goldsmith
<[EMAIL PROTECTED]> wrote:

> Clearly (?) I can do what I'm after if I use MxNx4 data, but is that the only 
> way to have a varying alpha?

Yep, currently that is the only way.  If you start with luminance, you
can use the colormapping code to generate RGB, and then attach an
alpha mask for RGBA and pass that to figimage or imshow.

JDH

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