python处理图片之PIL模块简单使用方法

#!/usr/bin/env python 
#encoding: utf-8 
import Image 
class myimg: 
 def __init__(self, open_file, save_file): 
 self.img = Image.open(open_file) 
 self.save_file = save_file 
 def Change_Size(self, percent=100, height=None, width=None): 
 ''''' 
 percent：以百分比来决定大小 
 height， width:以指定的高、宽来决定大小 
 ''' 
 if not (height and width): 
 width,height = self.img.size 
 new_img = self.img.resize((width*percent/100,height*percent/100),Image.BILINEAR) 
 new_img.save(self.save_file) 
 def Rotation(self, angle): 
 ''''' 
 angle： 旋转的度数 
 ''' 
 rot_img = self.img.rotate(angle) #旋转 
 rot_img.save(self.save_file) 
 def Save_as(self, filename): 
 ''''' 
 filename: 另存为图片格式，直接根据后缀名来 
 ''' 
 self.img.save(filename) 
 def Draw_Something(self): 
 ''''' 
 利用ImageDraw来画图形 
 ''' 
 import ImageDraw 
 draw = ImageDraw.Draw(self.img) 
 width,height = self.img.size 
 draw.line(((0,0),(width-1,height-1)),fill=255) #画直线 
 draw.line(((0,height-1),(width-1,0)),fill=255) 
 draw.arc((0,0,width-1,height-1),0,360,fill=255) #画椭圆 
 self.img.save(self.save_file) 
 def Enhance_Something(self): 
 ''''' 
 利用 ImageEnhance来增强图片效果 
 ''' 
 import ImageEnhance 
 brightness = ImageEnhance.Brightness(self.img) 
 bright_img = brightness.enhance(2.0) ##亮度增强 
 bright_img.save(self.save_file) 
 sharpness = ImageEnhance.Sharpness(self.img) 
 sharp_img = sharpness.enhance(7.0) #锐度增强 
 sharp_img.save(self.save_file) 
 contrast = ImageEnhance.Contrast(self.img) #对比度增强 
 contrast_img = contrast.enhance(2.0) 
 contrast_img.save(self.save_file) 
if __name__ == "__main__": 
 file_name = r"D:	est.png" 
 save_file = r"D:save.png" 
 saveas_file = r"D:save_as.bmp" 
 oimg = myimg(file_name, save_file) 
 oimg.Change_Size(30) 
 oimg.Rotation(45) 
 oimg.Save_as(saveas_file) 
 oimg.Draw_Something() 
 oimg.Enhance_Something()