用PIL库进行图像处理

一、如果系统里没有安装PIL库的，请先到命令提示符输入“pip install pillow”进行安装

二、之后就可以参考以下的代码

 1 from PIL import Image
 2 from pylab import *
 3 
 4 # 添加中文字体支持
 5 from matplotlib.font_manager import FontProperties
 6 font = FontProperties(fname=r"c:windowsfontsSimSun.ttc", size=14)
 7 figure()
 8 
 9 pil_im = Image.open('E:pythonPython Computer VisionImage dataempire.jpg')
10 gray()
11 subplot(121)
12 title(u'原图',fontproperties=font)
13 axis('off')
14 imshow(pil_im)
15 
16 pil_im = Image.open('E:pythonPython Computer VisionImage dataempire.jpg').convert('L')
17 subplot(122)
18 title(u'灰度图',fontproperties=font)
19 axis('off')
20 imshow(pil_im)
21 
22 show()

三，可以观看效果

四、其还可以进行旋转等操作

 1 from PIL import Image
 2 from pylab import *
 3 
 4 # 添加中文字体支持
 5 from matplotlib.font_manager import FontProperties
 6 
 7 font = FontProperties(fname=r"c:windowsfontsSimSun.ttc", size=14)
 8 figure()
 9 
10 # 显示原图
11 pil_im = Image.open('E:/python/Python Computer Vision/Image data/empire.jpg')
12 print(pil_im.mode, pil_im.size, pil_im.format)
13 subplot(231)
14 title(u'原图', fontproperties=font)
15 axis('off')
16 imshow(pil_im)
17 
18 # 显示灰度图
19 pil_im = Image.open('E:/python/Python Computer Vision/Image data/empire.jpg').convert('L')
20 gray()
21 subplot(232)
22 title(u'灰度图', fontproperties=font)
23 axis('off')
24 imshow(pil_im)
25 
26 # 复制并粘贴区域
27 pil_im = Image.open('E:/python/Python Computer Vision/Image data/empire.jpg')
28 box = (100, 100, 400, 400)
29 region = pil_im.crop(box)
30 region = region.transpose(Image.ROTATE_180)
31 pil_im.paste(region, box)
32 subplot(233)
33 title(u'复制粘贴区域', fontproperties=font)
34 axis('off')
35 imshow(pil_im)
36 
37 # 缩略图
38 pil_im = Image.open('E:/python/Python Computer Vision/Image data/empire.jpg')
39 size = 128, 128
40 pil_im.thumbnail(size)
41 print(pil_im.size)
42 subplot(234)
43 title(u'缩略图', fontproperties=font)
44 axis('off')
45 imshow(pil_im)
46 pil_im.save('E:/python/Python Computer Vision/Image data/empire thumbnail.jpg')# 保存缩略图
47 
48 #调整图像尺寸
49 pil_im=Image.open('E:/python/Python Computer Vision/Image data/empire thumbnail.jpg')
50 pil_im=pil_im.resize(size)
51 print(pil_im.size)
52 subplot(235)
53 title(u'调整尺寸后的图像',fontproperties=font)
54 axis('off')
55 imshow(pil_im)
56 
57 #旋转图像45°
58 pil_im=Image.open('E:/python/Python Computer Vision/Image data/empire thumbnail.jpg')
59 pil_im=pil_im.rotate(45)
60 subplot(236)
61 title(u'旋转45°后的图像',fontproperties=font)
62 axis('off')
63 imshow(pil_im)
64 
65 show()

查看效果：