1 from PIL import Image
2 import math
3
4
5 def rorate_left(image):
6 """
7 image 是一个 Image 对象
8 返回一个全新图像，它是 image 左转 90 度后的图像
9 """
10 width = image.size[0]
11 height = image.size[1]
12 img = Image.new('RGB', (height, width))
13
14 for x in range(height):
15 for y in range(width):
16 position_new = (x, y)
17 position_old = (width - y - 1, x)
18 color = image.getpixel(position_old)
19
20 img.putpixel(position_new, color)
21 return img
22
23
24 def rorate_right(image):
25 """
26 image 是一个 Image 对象
27 返回一个全新图像，它是 image 右转 90 度后的图像
28 """
29 width = image.size[0]
30 height = image.size[1]
31 img = Image.new('RGB', (height, width))
32
33 for x in range(height):
34 for y in range(width):
35 position_new = (x, y)
36 position_old = (y, height - x - 1)
37 color = image.getpixel(position_old)
38
39 img.putpixel(position_new, color)
40 return img
41
42
43 def rorate_180(image):
44 """
45 image 是一个 Image 对象
46 返回一个全新图像，它是 image 旋转 180 度后的图像
47 """
48 width = image.size[0]
49 height = image.size[1]
50 img = Image.new('RGB', (width, height))
51
52 for x in range(width):
53 for y in range(height):
54 position_new = (x, y)
55 position_old = (width - x - 1, height - y - 1)
56 color = image.getpixel(position_old)
57
58 img.putpixel(position_new, color)
59 return img
60
61
62 def main():
63 image = Image.open('a.jpg')
64 # img = rorate_left(image)
65 # img = rorate_right(image)
66 img = rorate_180(image)
67 img.save('b3.jpg')
68
69
70 main()
