# PIL图像

可以轻松的使用一下图像功能，官方API:<http://effbot.org/imagingbook/>

安装PIL

```
sudo apt-get install python-imaging
```

```python
from PIL import Image

def img_show(img):
     pil_img = Image.fromarray(np.uint8(img))
     pil_img.show()

(x_train, t_train), (x_test, t_test) = load_mnist(flatten=True,normalize=False)
img = x_train[0]
label = t_train[0]
print(label) # 5
print(img.shape) # (784,)
img = img.reshape(28, 28) # 把图像的形状变成原来的尺寸
print(img.shape) # (28, 28)
img_show(img)

'''
flatten=True时读入的图像是以一列（一维）NumPy
数组的形式保存的。因此，显示图像时，需要把它变为原来的28像素 × 28
像素的形状。可以通过reshape()方法的参数指定期望的形状，更改NumPy
数组的形状。此外，还需要把保存为NumPy数组的图像数据转换为PIL用
的数据对象，这个转换处理由Image.fromarray()来完成
'''
```

验证码图像

```python
import Image, ImageDraw, ImageFont, ImageFilter
import random

# 随机字母:
def rndChar():
    return chr(random.randint(65, 90))

# 随机颜色1:
def rndColor():
    return (random.randint(64, 255), random.randint(64, 255), random.randint(64, 255))

# 随机颜色2:
def rndColor2():
    return (random.randint(32, 127), random.randint(32, 127), random.randint(32, 127))

# 240 x 60:
width = 60 * 4
height = 60
image = Image.new('RGB', (width, height), (255, 255, 255))
# 创建Font对象:
font = ImageFont.truetype('Arial.ttf', 36)
# 创建Draw对象:
draw = ImageDraw.Draw(image)
# 填充每个像素:
for x in range(width):
    for y in range(height):
        draw.point((x, y), fill=rndColor())
# 输出文字:
for t in range(4):
    draw.text((60 * t + 10, 10), rndChar(), font=font, fill=rndColor2())
# 模糊:
image = image.filter(ImageFilter.BLUR)
image.save('code.jpg', 'jpeg');
```


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