请使用python语言生成一张白色背景由正方形的黑色像素色块组成的骷髅头图片

以下是生成骷髅头图片的Python代码：

from PIL import Image

# 设置图片大小和像素块大小
image_size = 200
pixel_size = 20

# 创建白色背景图片
image = Image.new('RGB', (image_size, image_size), 'white')

# 绘制黑色像素块组成的骷髅头
for i in range(5):
    for j in range(5):
        if (i == 0 and j in [1, 3]) or (i == 1 and j == 2) or \
           (i == 2 and j in [0, 4]) or (i == 3 and j in [0, 4]) or \
           (i == 4 and j in [1, 3]):
            pixel = Image.new('RGB', (pixel_size, pixel_size), 'black')
            image.paste(pixel, (i*pixel_size, j*pixel_size))

# 保存图片
image.save('skull.png')

生成的图片如下所示：