[pygame] question about transparent surfaces and alpha-value

[Horst JENS <horst.jens@xxxxxxxxx>]

Hi List,
just want to make sure i got this right, please correct me if i'm wrong:

if i have a jpg-file, i can set the transparency with the command 

pygame.Surface.set_alpha(alpha-value).

but if i hav a .png-file with already transparent background, i can not
set the alpha-value of that picture ? Of the visible pixels of
that .png-file, of course.

Here is a demo , what i want is the second face (right) also to become
more and more transparent:

http://www.spielend-programmieren.at/wiki/doku.php?id=code:colordemo1.py


greetings,
-Horst

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