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
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