python利用PIL库读取图片的EXIF信息详解编程语言

# -*- coding: Windows-1251 -*- 
''' 
rename_to_exiftime.py 
 
Rename JPEG files according to EXIF-date using PIL 
 
If global variable CREATE_HARDLINK is set, script creates Windows (XP) batch file  
for creating hardlink version of source files 
 
Author: Denis Barmenkov <[email protected]> 
 
Modified by: Jorge Barnaby <[email protected]> 
Improved rename process on duplicates 
 
Copyright: this code is free, but if you want to use it,  
           please keep this multiline comment along with function source.  
           Thank you. 
 
2009-02-10 18:14  
''' 
 
import Image 
 
import os 
import re 
import sys 
import time 
 
CREATE_HARDLINK=0 
 
def extract_jpeg_exif_time(jpegfn): 
    if not os.path.isfile(jpegfn): 
        return None 
    try: 
        im = Image.open(jpegfn) 
        if hasattr(im, '_getexif'): 
            exifdata = im._getexif() 
            ctime = exifdata[0x9003] 
            #print ctime 
            return ctime 
    except:  
        _type, value, traceback = sys.exc_info() 
        print "Error:/n%r", value 
 
    return None 
 
def get_exif_prefix(jpegfn): 
    ctime = extract_jpeg_exif_time(jpegfn) 
    if ctime is None: 
        return None 
    ctime = ctime.replace(':', '') 
    ctime = re.sub('[^/d]+', '_', ctime) 
    return ctime 
 
def rename_jpeg_file(fn): 
    if not os.path.isfile(fn): 
        return 0 
    ext = os.path.splitext(fn)[1].lower() 
    if ext not in ['.jpg', '.jpeg', '.jfif', '.nef', '.png']: 
        return 0 
    path, base = os.path.split(fn) 
    #print base # status 
    prefix = get_exif_prefix(fn) 
    if prefix is None: 
        print '%s could not be renamed' % (base) 
        return 0 
    if base.startswith(prefix): 
        print '%s file already renamed' % (base) 
        return 0 # file already renamed to this prefix 
 
    exists = True 
    index = 0 
    while exists: 
        if index == 0: 
            new_name = prefix + ext # + '_' + base 
        else: 
            new_name = prefix + '_' + str(index) + ext 
        new_full_name = os.path.join(path, new_name) 
        exists = os.path.isfile(new_full_name) 
        index = index + 1 
 
    if CREATE_HARDLINK: 
        f = open('CREATE_HARDLINK.cmd', 'a') 
        f.write('fsutil hardlink create "%s" "%s"/n' % (new_full_name, fn)) 
        f.close() 
    else: 
        try: 
            os.rename(fn, new_full_name) 
            print '%s renamed to %s' % (base, new_name)  
        except: 
            print 'ERROR rename %s --> %s' % (fn, new_full_name) 
            return 0 
 
    return 1 
 
def rename_jpeg_files_in_dir(dn): 
    names = os.listdir(dn) 
    count=0 
    for n in names: 
        file_path = os.path.join(dn, n) 
        count += rename_jpeg_file(file_path) 
    return count 
 
if __name__=='__main__': 
    try: 
        path = sys.argv[1] 
    except IndexError: 
        print '''Usage:   
 
  rename_to_exiftime.py  filename.[jpeg|jpg|jfif] 
 
or 
 
  rename_to_exiftime.py  dirname 
''' 
        sys.exit(1) 
 
    if os.path.isfile(path): 
        rename_jpeg_file(path) 
    elif os.path.isdir(path): 
        count = rename_jpeg_files_in_dir(path) 
        print '%d file(s) renamed.' % count 
    else: 
        print 'ERROR: path not found: %s' % path 

PIL 库下载地址:
http://www.pythonware.com/products/pil/