Can someone give me some example code that creates a surface with a transparent background in pygame?
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3 Answers
This should do it:
image = pygame.Surface([640,480], pygame.SRCALPHA, 32)
image = image.convert_alpha()
Make sure that the color depth (32) stays explicitly set else this will not work.
2 Comments
Forsaken_Knight77
I second that -
image = pygame.Surface([640, 480], pygame.SRCALPHA) is all you need.
Ethan McRae
I would like to also add that you now set colors like this:
cloud_color = (255, 255, 255, 120) where the last value can range from 0 to 255.You can also give it a colorkey, much like GIF file transparency. This is the most common way to make sprites. The original bitmap has the artwork, and has a certain color as background that will not be drawn, which is the colorkey:
surf.set_colorkey((255,0,255)) // Sets the colorkey to that hideous purple
Surfaces that uses colorkey instead of alpha are a lot faster to blit since they don't require any blend math. The SDL surface uses a simple bitmask when it has a colorkey set, which blits practically without overhead.
1 Comment
Astariul
This is the right answer. Link : riptutorial.com/pygame/example/23788/transparency
You have 3 possibilities:
Set a transparent color key with
set_colorkey()The color key specifies the color that is treated as transparent. For example, if you have an image with a black background that should be transparent, set a black color key:
my_surface.set_colorkey((0, 0, 0))You can enable additional functions when creating a new surface. Set the
SRCALPHAflag to create a surface with an image format that includes a per-pixel alpha. The initial value of the pixels is (0, 0, 0, 0):my_surface = pygame.Surface((width, height), pygame.SRCALPHA)Use
convert_alpha()to create a copy of the Surface with an image format that provides alpha per pixel.However, if you create a new surface and use
convert_alpha(), the alpha channels are initially set to maximum. The initial value of the pixels is (0, 0, 0, 255). You need to fill the entire surface with a transparent color before you can draw anything on it:my_surface = pygame.Surface((width, height)) my_surface = my_surface.convert_alpha() my_surface.fill((0, 0, 0, 0))
