Python图片处理PIL/pillow/生成验证码/出现KeyError: 和The _imagingft C module is not installed

最近在用Python开发自己的博客，需要用到Python生成验证码，当然肯定要用到Python的图形处理库PIL，因为我用的是windows。

所以在安装好pil之后就开始写，就按照题目所说出现了The _imagingft C module is not installed 错误，找了很多建议，最后确定在windows下应该用pillpw。下载地址 点击打开链接 找到 Pillow‑2.5.2.win32‑py2.7.exe因为我用的是python2.7和win32系统，所以就应该下载这个,大家可以根据自己的需求找到响应的包进行安装， Pillow, 它是对PIL的一些BUG修正后的编译版   

到了这里又遇见一个错误，那就是在使用Image.save('code.jpg','jpg')的时候会出现KeyError:’jpg‘错误，

看stackoverflow文章 http://stackoverflow.com/questions/21128256/why-does-pillow-not-recognize-the-jpeg-format

受到启发之后只需要把import Image改为 from PIL import Image 就行了

顺便附上一个生产中文验证码的代码

import ImageDraw,ImageFont
from PIL import Image 
import random
import math, string  
 
class RandomChar():
 
  @staticmethod
  def Unicode():
    val = random.randint(0x4E00, 0x9FBF)
    return unichr(val)  
 
  @staticmethod
  def GB2312():
    head = random.randint(0xB0, 0xCF)
    body = random.randint(0xA, 0xF)
    tail = random.randint(0, 0xF)
    val = ( head << 8 ) | (body << 4) | tail
    str = "%x" % val
    return str.decode('hex').decode('gb2312')  
 
class ImageChar():
  def __init__(self, fontColor = (0, 0, 0),
                     size = (100, 40),
                     fontPath = 'simsun.ttc',
                     bgColor = (255, 255, 255),
                     fontSize = 20):
    self.size = size
    self.fontPath = fontPath
    self.bgColor = bgColor
    self.fontSize = fontSize
    self.fontColor = fontColor
    self.font = ImageFont.truetype(self.fontPath, self.fontSize)
    self.image = Image.new('RGB', size, bgColor)  
 
  def rotate(self):
    self.image.rotate(random.randint(0, 30), expand=0)  
 
  def drawText(self, pos, txt, fill):
    draw = ImageDraw.Draw(self.image)
    draw.text(pos, txt, font=self.font, fill=fill)
    del draw  
 
  def randRGB(self):
    return (random.randint(0, 255),
           random.randint(0, 255),
           random.randint(0, 255))  
 
  def randPoint(self):
    (width, height) = self.size
    return (random.randint(0, width), random.randint(0, height))  
 
  def randLine(self, num):
    draw = ImageDraw.Draw(self.image)
    for i in range(0, num):
      draw.line([self.randPoint(), self.randPoint()], self.randRGB())
    del draw  
 
  def randChinese(self, num):
    gap = 5
    start = 0
    for i in range(0, num):
      char = RandomChar().GB2312()
      x = start + self.fontSize * i + random.randint(0, gap) + gap * i
      self.drawText((x, random.randint(-5, 5)), RandomChar().GB2312(), self.randRGB())
      self.rotate()
    self.randLine(18)  
 
  def save(self, path):
    self.image.save(path,'jpeg')
if __name__=='__main__':
  ic = ImageChar(fontColor=(100,211, 90))
  ic.randChinese(4)
  ic.save("1.jpeg")