How to get Exif data from a jpeg file

[BJ Swope]

On Sun, May 17, 2009 at 4:17 AM, Arnaud Delobelle
<arnodel at googlemail.com> wrote:
>
> Daniel Fetchinson <fetchinson at googlemail.com> writes:
>
> >> I need to get the creation date from a jpeg file in Python.  Googling
> >> brought up a several references to apparently defunct modules.  The best
> >> way I have been able to find so far is something like this:
> >>
> >> from PIL import Image
> >> img = Image.open('img.jpg')
> >> exif_data = img._getexif()
> >> creation_date = exif_data[36867]
> >>
> >> Where 36867 is the exif tag for the creation date data (which I found by
> >> ooking at PIL.ExifTags.TAGS).  But this doesn't even seem to be
> >> documented in the PIL docs.  Is there a more natural way to do this?
> >
> >
> > Have you tried http://sourceforge.net/projects/exif-py/ ?
> >
> > HTH,
> > Daniel
>
> I will have a look - thank you.
>
> --
> Arnaud
> --
> http://mail.python.org/mailman/listinfo/python-list


I use the EXIF module to do bulk renames of all the pictures in a directory.

Here's my hackeration...



import sys
import os
import re
import time
import win32file
import datetime
import EXIF

DATE_FORMAT   = '%Y%m%d_%H%M%S'
allowed_files = ['.asf', '.jpg', '.mod', '.mov', '.mpeg', '.mpg',
'.jpeg', '.png', '.tiff', '.tif']
named_files = []

r = re.compile('.mod',)

def is_a_file(path, file, xtn):
    """
    We only want to rename the files right?
    Return True or False depending on whether object is a file or a directory
    """

    if os.path.isdir(os.path.join(path,file)):
        print "This is a directory not a file.  Will not rename!"
        return False
    if allowed_files.count(xtn):
        return True
    else:
        print file, "is not a in the list of allowed extensions. Will
not rename!"
        return False


def renameFile(path, file):
    """ Rename <old_filename> with the using the date/time created or
modified for the new file name"""

    old_filename = os.path.join(path,file)

    (name,xtn) = os.path.splitext(file)
    xtn = xtn.lower()

    if re.search(r, xtn):
        xtn_old = xtn
        xtn = '.mpg'
        print xtn_old, 'changed to', xtn

    if is_a_file(path, file, xtn):
        created_time = os.path.getctime(old_filename)
        modify_time = os.path.getmtime(old_filename)

        f = open(old_filename, 'rb')
        try:
            tags=EXIF.process_file(f)
        except UnboundLocalError:
            print "No EXIF data available for ", file
            tags = {}
            exif_time = 0
        try:
            tags['EXIF DateTimeOriginal']
            exif_time = str(tags['EXIF DateTimeOriginal'])
            exif_time = int(time.mktime(time.strptime(exif_time,
"%Y:%m:%d %H:%M:%S")))
        except (KeyError,ValueError):
            print 'No EXIF DateTimeOriginal for ', file
            exif_time = 0
        f.close()

        if created_time < modify_time:
            local_time = time.localtime(created_time)
        else:
            local_time = time.localtime(modify_time)

        if exif_time:
            if exif_time < local_time:
                local_time = time.localtime(exif_time)

        date_time_name = time.strftime(DATE_FORMAT, local_time)

        copy_number = named_files.count(date_time_name)
        named_files.append(date_time_name)

        new_name = date_time_name + "_" + str(copy_number) + xtn

        new_filename = os.path.join(path, new_name)

        print 'Renaming:', old_filename, 'to', new_filename
        #print 'Created Time  = ', created_time
        #print 'Modified Time = ', modify_time
        #print 'EXIF Time     = ', exif_time
        #print 'Time Used     = ', local_time
        os.rename(old_filename, new_filename)


if __name__ == '__main__':
    if os.path.isdir(sys.argv[1]):
        """Recursively walk the directory listed as Arg 1 and work each file."""
        print
        for path,dirs,files in os.walk(sys.argv[1]):
            for file in files:
                renameFile(path, file)
    else:
        print "\nNo path to rename specified.\n"
        print "Usage:\n\tpython", sys.argv[0], "<path to directory of
source files>"
        sys.exit(1)




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