DZone Snippets: exif code

Change system date of photos to EXIF date

cdvddt (Raphael Jolivet) — Sat, 02 Jun 2007 00:10:16 GMT

This script takes a list of files as arguments.
It set the system datetime (both modifitation and access) to the date
the photo was taken.

It use the EXIF module for that, that needs to be in the same folder as the script :
You can find it here :
http://home.cfl.rr.com/genecash/digital_camera/EXIF.py



#!/usr/bin/python



import sys

import EXIF

from datetime import *

import time

import os



# Loop on arguments (files)

for arg in sys.argv[1:] :

    

    # Do nothing of dirs

    if os.path.isdir(arg) :

        continue



    # Open the file

    f=open(arg, 'rb')

 

    # Read exif data

    tags = EXIF.process_file(f)

    

    # Ensure date is present 

    if not tags.has_key("Image DateTime") :

        continue 

        

    # Get date of photo

    date = tags["Image DateTime"]

    date = datetime(*(time.strptime(date.values, "%Y:%m:%d %H:%M:%S")[0:6]))

    timestamp = int(time.mktime(date.timetuple()))

    

    # Some traces

    print "File:%s - Time:%s " % (arg, timestamp)



    # Change the date

    os.utime(arg, (timestamp, timestamp))

Read & Write JPEG COM and EXIF metadata

korakot (Korakot Chaovavanich) — Tue, 27 Dec 2005 20:07:51 GMT

This snippet is similar to my previous one.



import jpeg



#read/write JPEG comments (aka the COM area)

jpeg.getComments(file)

jpeg.setComments(txt, file)



#read/write some EXIF data

e = jpeg.getExif(file)   #an Exif object

e2 = jpeg.getExif2(file) #an Exif extension segment as Exif instance too



#quick getter

d = e.dict()

print d['image description']

e.display()  #function to print all tags and their value, type, etc.



#some tags with an explicit interface, some are writable

print e.description

e.description = "my nice picture"



#generic read function

print e.get(0x010e)  #value for a tag number you know

print e.get(0x010e, value=False) #get the tag as a Tag instance



#generic write function

e.set(0x010e, "my nice picture", e.ifd0, 2)

    #e.ifd0, e.exif, e.gps or e.interop, represents the IFD the tag belongs to

    #and 2 represents the fact that the tag is of ASCII type

    #see www.exif.org specifications for details



#iterate

for tag in e:

   print tag.getValue() #value parsed

   print tag.value      #value raw

   tag.setValue(100)    #change it



#save the changed Exif segment back into the image file

jpeg.setExif(e, file)

See more details, and download the module here.

Reading and writing image metadata

korakot (Korakot Chaovavanich) — Thu, 29 Sep 2005 22:09:49 GMT

The IPTCInfo module allows you to add/edit metadata
to your image. You can download it from here.

Reading



from iptcinfo import IPTCInfo

info = IPTCInfo('test.jpg')

print info.keywords, info.supplementalCategories, info.contacts

caption = info.data['caption/abstract']

Add/Edit



info = IPTCInfo('test.jpg')

info.data['caption/abstract'] = 'Witty caption here'

info.data['supplemental category'] = ['portrait']

info.save()

info.saveAs('test_out.jpg')  # keep original safe