Thursday, December 22, 2011

Software to Detect if an Image has been Altered or Photoshopped

Which one is real ?
User52 : Does anyone know how to tell if an image has been Photoshopped? 

Like User52, ever wondered if a digital image has been altered? Improvements in photo manipulation softwares such as Photoshop and GIMP have made image alteration both easier to commit and harder to detect. 

But now thanks to a small software called JPEGsnoop, anyone can determine if a photo is edited using any photo editing software. Though not foolproof, this free and portable utility for Windows does a great job at detecting if an image is original or it has been altered.

First download JPEGsnoop from here and extract JPEGsnoop.exe anywhere on your computer. Start the software and check “I have read the terms” box and click OK (see screenshot below).



Program's main window will appear, now drag the image to this window and wait for the report to generate. Scroll down to the last paragraph of this report and look for the word "assessment". Here if it says “Image is processed/edited”, then the image is surly been altered by software means. Chances are, directly above that that line you may even find what program was used to edit the image!


(Click to Enlarge)


The only drawback of JPEGsnoop is that it can't predict what portions of the image has been altered and to what extent the modified image is different from the original one. That is, it can tell if an image has been altered from its original but not by how much.

Image Error Level Analyzer is a great online tool, using which, you can perform a quick scan of a JPEG image and analyze which sections might be modified. You can even play with the quality slider to spot anomalies in the error level.


FotoForensics is another online tool that's worth mentioning here. Do check their tutorial page that demonstrates different modification levels with sample photos. 

Mac Users can use the software Photo Sniff ( priced at $1.99 in the Mac App Store) to accomplish the same.

Also Check :

50 comments:

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    really nice blog...

    ReplyDelete
    Replies
    1. Thanks for your kind words :)
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  2. Okay, so I'm really bummed to see that the Error Level Analyzer has been taken down because, by the looks of the example, it's pretty sweet. I don't have a Mac, so I can't get the app, but is there similar software besides the above that would work on windows? Thanks.

    ReplyDelete
    Replies
    1. Your wish is my command. I updated the post with an alternative of Error Level Analyzer. Hope it helps :)

      Delete
  3. I was given a picture that was printed out on a laser printer on plain copy paper, how to I tell if it has been photo shopped?

    ReplyDelete
  4. "Anonymous Wednesday, June 27, 2012 12:52:00 PM

    I was given a picture that was printed out on a laser printer on plain copy paper, how to I tell if it has been photo shopped?"

    Once the picture has been printed, and all you have is the print copy, all you can do is take a good magnifying glass and go around the picture looking for anomalies (such as a color pixel that looks out of place, which could mean that something was cut out or moved), pixels that don't match up with the picture or jagged edges that don't match up with edges on the rest of the picture.

    ReplyDelete
  5. Really nice post dude! Is there any tool which will combine both metadata and error analysis?

    ReplyDelete
    Replies
    1. Unfortunately I still haven't found any. Will update this post in case I come across any such software :)

      Delete
  6. can i find which software is used for editing

    ReplyDelete
    Replies
    1. JPEGSnoop can help you with that ! Check the analysis screenshot :)

      Delete
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  15. SumoPaint
    SumoPaint is another free online and desktop photo editor with basic and advanced features. You can upload a photo from your computer or from a URL.
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    The left pane has the drawing tools which include several shapes. One, in particular, is called the Symmetry tool, which “mirrors” a shape’s stroke, creating a symmetric pattern.
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  30. Hi...
    As posted on Reddit, the new Mirage app from Akshat Jagga does just that. It detects when an image has been edited and tries to identify those edits. ... The tool was so good at detecting deception that it even outperformed human examiners who were asked to look closely at the pictures for signs of manipulation.
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