method to reveal photoshop manipulations


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

.

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