Photo ELA Error Level Analysis - Detecting Fake Images

ELA Error Level Analysis is a fantastic fake image detection tool.

Manipulation of images are detected by looking for the following clues:


1: Shadows - Compare different objects and the direction of the light source - round objects are good.
2: Reflections - See if they all match up.
3: Eyes - Zoom in and compare against other eyes. (Dots/colors give light direction)
4: Clones - Can you spot a duplicate patch?
5: EXIF - Look for hidden clues in EXIF file data. (GPS Position data, Time, RBG Color Profile Changes, Compare Image Compression Signature)
6: ELA - Photo Analysis. Error level analysis (ELA) works by re-saving the image at 95% compression. Then calculating the difference. Big changes indicate its a manipulated. Touched up areas are easily seen. Blue/Red areas are generally Photoshop at work. Read the tutorial below for details.


Free Tools:

FotoForensics - Photo ELA Error Level Analysis Image Tool
http://fotoforensics.com/
Example: http://fotoforensics.com/sample01.php
Tutorial: http://fotoforensics.com/tutorial.php
Original Developer: http://www.errorlevelanalysis.com/

Jeffrey's Exif Viewer - Online EXIF data and GPS viewer with Map!
http://regex.info/exif.cgi


JPEGsnoop - Fake image detection via image signature analysis
http://sourceforge.net/projects/jpegsnoop/

IEXIF 2 - PC based EXIF data viewer (includes GPS)
http://opanda.com/en/iexif/

Advanced Reading: http://up.stevetjoa.com/stamm2010icip.pdf


To get a better idea on how easy it is to manipulate an image try this tutorial with audio.
It will be the best 5 minutes you ever spent watching YouTube.
Removing / Creating / Filling / Faking / Objects / Images in Photoshop CS5 using the Content-Aware Fill tool:




1 comment:

  1. This was a good suggestion that you put up here...dude…..hope that it benefits all the ones who land up here. 

    Hong Kong Tutor

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