Rename images according to their creation time.

img_util.py

import sys
from glob import glob
from os import stat, rename
from os.path import splitext
from PIL import Image
from PIL.ExifTags import TAGS
from pyexif import ExifEditor
from time import strptime, mktime

# does not work as of 9/22/2011 - exception on _getexif() below
def get_exif(fn):
    ret = {}
    i = Image.open(fn)
    exif = i._getexif()
    for key, value in exif.items():
        decoded = TAGS.get(key, key)
        ret[decoded] = value

    return ret


def get_ctime(fn):
    try:
        exif_info = get_exif(fn)
        time = mktime(strptime(exif_info['DateTime'], '%Y:%m:%d %H:%M:%S'))
    except:
        time = stat(fn).st_ctime

    return time


def get_caption(fn):
    try:
        exif_info = ExifEditor(fn)
        caption = exif_info.getTag('UserComment')
        if caption.startswith('ASCII\x00\x00\x00'):
            caption = caption.replace('ASCII\x00\x00\x00', '')
    except:
        caption = ""

    return caption


def get_image_filenames(get_jpgs=True, get_nefs=True):
    images =  []
    
    if get_jpgs:
        jpgs = glob('*.[jJ][pP][gG]')
        if len(jpgs) > 0:
            images += jpgs

    if get_nefs:
        nefs = glob('*.[nN][eE][fF]')
        if len(nefs) > 0:
            images += nefs

    return images


def get_images_sorted_by_ctime():
    images = []
    for fn in get_image_filenames():
        images.append({'filename':fn, 'ctime':get_ctime(fn)})

    images = sorted(images, key=lambda image: image['ctime'])

    return images


def rename_image(fn, prefix, suffix=0):
    basename, ext = splitext(fn)
    new_fn = "{0}_{1:03d}{2}".format(prefix, suffix, ext)
    print "Renaming {0} to {1}".format(fn, new_fn)
    rename(fn, new_fn)

rename.py

#!/usr/bin/python2

import sys
from img_util import *

if len(sys.argv) <= 1:
    print "Syntax: {0} PREFIX [OFFSET_NUMBER]".format(sys.argv[0])
    sys.exit(1)

prefix = sys.argv[1]

try:
    offset = int(sys.argv[2])
except:
    offset = 0

images = get_images_sorted_by_ctime()

for i in range(len(images)):
    rename_image(fn=images[i]['filename'], prefix=prefix, suffix=i+offset)