I just fixed this. It turns out that libtiff returns two parameters to
specify alpha, and I was only expecting one. Amazing what you learn when
you actually read the documentation :-)

-- 
Adam Fedor, Digital Optics            | Fudd's law of opposition: Push
[EMAIL PROTECTED]  http://www.doc.com     | something hard enough, and it 
[EMAIL PROTECTED]  http://www.gnustep.org | will fall over.

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