At the Aachen Summerschool applied IT security Steven J. Murdoch came up with an automatic way to analyze if the thumbnal in a JPEG file is different from the real image. There was widely discussed incident featuring a topless thumbnail and we wanted to know how widespread this problem is. So we crawled the net for images and used Steven’s tools to filter for interesting ones. The tool outputs the main image (left) besides the thumbnail (right).
90% of the rest are cropped images. Sometimes just boring stuff has ben cropped, but on other instances interesting details where removed:
Then there are photoshopped images where the Thumbnail reveals the base for the modification:
Then there are a lot of Images where the Background has been removed:
Probably this is the most scary image: There the face has been obscured but the thumbnail contained the original face:
And finally there seem to be images where there are no similarities between the main image and the thumbnail:
And with certain images the tool sees differences where no differences are visible to the human eye:
Comments 5
You can do some screening yourself at http://sauna.5711.org/~md/thumbnails/
This comment was originally posted on 20050212T21:15:10
Posted 16 Oct 2008 at 7:51 ¶For a clue as to the difference between the final image and its thumbnail, look at the red and green borders. The red-bordered image is in portrait orientation while the green-bordered thumbnail is in landscape orientation, with black filling the space at either side.
Posted 10 Dec 2008 at 0:20 ¶I would like to get hold of the original of one of those images. Or any image with a thumbnail that does not correspond to the actual image. Can someone help me with this?
Posted 07 Jan 2009 at 15:29 ¶I don’t have any at hand anymore, sorry.
Posted 10 Jan 2009 at 2:26 ¶See the page I have included as my* website. Click on the image and you will see the jpeg by itself. It is a photograph published in Yank, a magazine for U.S. soldiers in WWII. The thumbnail shows the whole page of the magazine.
* It is not my website. It is yankmagazine.blogspot.com, a wonderful repository of material from Yank.
Posted 15 Jan 2009 at 0:38 ¶Post a Comment