Re: method to reveal photoshop manipulations


"sobriquet" <dohduhdah@xxxxxxxxx> wrote in message
news:1190737274.789118.204840@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Suppose I have a picture and I modify the picture in photoshop to
remove an element in one part of the picture and add an element in
another part of the picture. Subsequently I save the original with the
same settings as the modified picture and I remove the meta-info
(exif, etc..) of both pictures with a utility (e.g. jhead).
Is there any method to more or less objectively determine which of
these two pictures is the original and which one has been manipulated?

Below I have two pictures for instance, one of which has been
manipulated. Can you guess/determine which one of them has been
modified?

http://www.ibbu.nl/~nsprakel/x.jpg
http://www.ibbu.nl/~nsprakel/y.jpg



My guess:

It appears that x.jpg has been modified by adding the cyclist and other
parts of the scenery from y.jpg. This modification makes it appear that the
cyclist has not changed position between the two images which were taken at
different times.

Anyway, I think that in answer to your question, that the answer is probably
negative. I suspect that image manipulation is largely a subjective,
judgment call. But the cavernous abyss that is my lack of knowledge about
software and how changes to images may be analyzed by it should be taken
into consideration along with my opinion.

I do think that there is an objective means to determine that certain images
have not been manipulated, but that requires certain equipment manufactured
for forensic photography and doesn't really answer your question.

Eric Miller
www.dyesscreek.com


.

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