Hi Ian,
There's not enough information to make a diagnosis. What was the error?
Are you sure the surface has per-pixel alpha? What array package are you
using? With NumPy and the latest Pygame I get no error:
>>> import pygame as pg
>>> s = pg.Surface((10,10), pg.SRCALPHA, 32)
>>> a = pg.surfarray.pixels_alpha(s)
>>> a[:,:] = 255 - a[:,:]
>>> del a
>>> s.get_at((0,0))
(0, 0, 0, 255)
Lenard
Ian Mallett wrote:
Hello,
I need to make a function where the alpha value of a surface is
flipped. I can already do this with the red, green, or blue channels:
#red flip
array = pygame.surfarray.pixels3d(surface)
array[:,:,0] = 255-array[:,:,0]
del array
#green flip
array = pygame.surfarray.pixels3d(surface)
array[:,:,1] = 255-array[:,:,1]
del array
#blue flip
array = pygame.surfarray.pixels3d(surface)
array[:,:,2] = 255-array[:,:,2]
del array
#rgb flip
array = pygame.surfarray.pixels3d(surface)
array[:,:,:] = 255-array[:,:,:]
del array
I can't do the alpha flip though. I tried:
array = pygame.surfarray.pixels_alpha(surface)
array[:,:] = 255-array[:,:]
del array
but it raises an error.
Ideas?
Thanks,
Ian
--
Lenard Lindstrom
<[email protected]>
