python让图片按照exif信息里的创建时间进行排序的方法

本文实例讲述了python让图片按照exif信息里的创建时间进行排序的方法。分享给大家供大家参考。具体分析如下：

我们经常会从不同的设备里取出照片，比如照相机，手机，iphone等等，操作系统记录的创建日期经常 会因为拷贝等原因变动，下面的代码可以给图片按照exif里的创建时间进行排序，非常有用。

import os

import shutil

import Image

from PIL.ExifTags import TAGS

def print_all_known_exif_tags():

 for k in sorted(TAGS):

 print k, TAGS[k]

def print_all_exif_tags(image):

 try:

 img = Image.open(image)

 except Exception, e:

 print image, "skipping due to", e

 else:

 xf = img._getexif()

 for tag in xf:

 print TAGS.get(tag), xf[tag]

 finally:

 print 'done'

def get_minimum_creation_time(exif_data):

 mtime = "?"

 if 306 in exif_data and exif_data[306] < mtime: # 306 = DateTime

 mtime = exif_data[306]

 if 36867 in exif_data and exif_data[36867] < mtime: # 36867 = DateTimeOriginal

 mtime = exif_data[36867]

 if 36868 in exif_data and exif_data[36868] < mtime: # 36868 = DateTimeDigitized

 mtime = exif_data[36868]

 return mtime

def get_creationdate_with_filename_as_dict(list_of_folders):

 print "Processing all image files in:"

 result = {}

 for folder in list_of_folders:

 print "- " + folder

 counter = 0

 for f in os.listdir(folder):

 counter += 1

 fullFileName = folder + "\\" + f

 try:

 img = Image.open(fullFileName)

 except Exception, e:

 print " Skipping '%s' due to exception: %s"%(f, e)

 continue

 mtime = get_minimum_creation_time(img._getexif())

 i = 0

 while mtime+"_"*i in result:

 i += 1

 mtime = mtime+"_"*i

 result[mtime] = fullFileName

 print " Found %s orignal files in %s."%(counter, folder)

 print "Added total of %s to dictionary."%len(result)

 return result

def copy_from_image_dict_to_directory(image_dict, output_dir):

 assert os.path.exists(output_dir)

 for i,key in enumerate(sorted(image_dict)):

 dummy, extension = os.path.splitext(image_dict[key])

 new_file_name = key.replace(":", "-") + extension

 output_file = output_dir + new_file_name

 shutil.copy2(image_dict[key], output_file)

 print "Copied %s files to %s"%(i+1, output_dir)

if __name__=="__main__":

 source_dir = "/var/tmp/images"

 output_dir = "/var/tmp/output"

 # obtain /var/tmp/images/iPhone, /var/tmp/images/CanonPowerShot, /var/tmp/images/Nikon1

 list_of_folders = [source_dir + subfolder for subfolder in os.listdir(source_dir)]

 all_files = get_creationdate_with_filename_as_dict(list_of_folders)

 copy_from_image_dict_to_directory(all_files, output_dir)

希望本文所述对大家的Python程序设计有所帮助。

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