Well, .set_alpha() docs tells that per pixel alpha overrides surface alpha, so you can set the alpha but will have no effect.
If you are on pygame 1.8.1, you can blit to a temporary surface with BLEND_MULT flags, the final pixel - channel will go as: tmp = a*b/256 where a.blit(b,.., BLEND_MULT) ( interpret the formula as per-pixel per channel) then blit the tmp to the desired surface. -- claxo On Wed, Sep 24, 2008 at 2:04 AM, Horst JENS <[EMAIL PROTECTED]> wrote: > > 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 >
