Python改变图片的类型

和跟老师做的项目，需要用到多种类型的图片的转换，将10000张图片（含pgm类型）转换为JPG、png、bmp类型的各一万张，看了老师推荐的博客，c#处理pgm。哎老实说，根本看不懂啊。就用了最简单的方式，用Python实现。

不知道以后看到这个简单的代码会不会发笑哈哈哈
1>转换

import os
from PIL import Image
import sys

def get_imlist(path):
    return[os.path.join(path,f) for f in os.listdir(path)]

directory1=get_imlist('/home/winney/images/bmp/')
directory2=get_imlist('/home/winney/images/jpg/')
directory3=get_imlist('/home/winney/images/pgm/')
#directory3=get_imlist('/home/winney/images/Photex_pgm/VosskuhlerCCD1300LN_pgm/')
directory4=get_imlist('/home/winney/images/png/')

counter=0
for directory in [directory1,directory2,directory3,directory4]:
    for in_image in directory:
        try:
            img=Image.open(in_image)
            counter=counter+1
            out_image1=str(counter)+".jpg"
            out_image2=str(counter)+".png"
            out_image3=str(counter)+".bmp"
            to_save1="/home/winney/original_image/"+out_image1
            to_save2="/home/winney/original_image/"+out_image2
            to_save3="/home/winney/original_image/"+out_image3
            img.save(to_save1)
            img.save(to_save2)
            img.save(to_save3)
        except Exception,e:
            print e,in_image

"""for directory in [directory1,directory2,directory3,directory4]:
    if not os.access(directory,os.F_OK):
        print directory,"isn't a valid directory !"
        sys.exit()
    print "Directory",directory
    for in_image in os.walk(directory):
        out_image=os.path.splitext(in_image)[0]+".jpg" 
        #in_image=os.path
        #out_image=in_image[0:in_image.find(".")+1]+"jpg"
        try:
            Image.open(in_image).save("/home/winney/original_image/"+out_image)
        except IOError:
            print "cannot convert",in_image"""

2>统计

import os
from PIL import Image
import sys

def get_imlist(path):
    return[os.path.join(path,f) for f in os.listdir(path) if f.endswith('.pgm')]
def get_imlist(path):
    return[os.path.join(path,f) for f in os.listdir(path)]

directory=get_imlist('/home/winney/original_image')
counter1=0
counter2=0
counter3=0
for in_image in directory:
    if in_image.endswith('.jpg'):
        counter1=counter1+1
    elif in_image.endswith('png'):
        counter2=counter2+1
    elif in_image.endswith('bmp'):
        counter3=counter3+1
print counter1,' ',counter2,' ',counter3