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。

复制代码 代码如下:
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。