如何在pygame中制作Surface的灰度副本? [英] How can I make a greyscale copy of a Surface in pygame?
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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.
推荐答案
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)
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