python利用PIL庫讀取圖片的EXIF信息

# -- 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 <denis.barmenkov@gmail.com>
Modified by: Jorge Barnaby <jorge.barnaby@gmail.com>
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_exiftime(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

</pre> 

 PIL 庫下載地址: 
http://www.pythonware.com/products/pil/