如何在pygame中制作Surface的灰度副本?
问题描述：
在pygame中，我有一个表面:
In pygame, I have a surface:
im = pygame.image.load('foo.png').convert_alpha()
im = pygame.transform.scale(im, (64, 64))
如何获得图像的灰度副本，或将图像数据转换为灰度?我有麻木.
How can I get a grayscale copy of the image, or convert the image data to grayscale? I have numpy.
答
使用Surfarray，并使用numpy或Numeric对其进行过滤:
Use a Surfarray, and filter it with numpy or Numeric:
def grayscale(self, img):
arr = pygame.surfarray.array3d(img)
#luminosity filter
avgs = [[(r*0.298 + g*0.587 + b*0.114) for (r,g,b) in col] for col in arr]
arr = numpy.array([[[avg,avg,avg] for avg in col] for col in avgs])
return pygame.surfarray.make_surface(arr)