[Image-SIG] Putalpha on a color (r, v, b)

[pyprog]

Hello,

I present myself: I'm a professor of visual arts and I live in Caen in
Normandy (France) .

I'm new with PIL, and I want to know how to put alpha channel on a color
(not simply a band) . 

putalpha(band) works only with one band at the same time, it is that? .
I would like to make a trick of the style ==> putalpha((108, 128, 199)),
that is it possible (?), and how to make? .

Thank you in advance .

monsitt

-- 
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http://monsitt.irruption.net