Re: method to reveal photoshop manipulations

On 25 sep, 22:59, Eric Miller <millereric_nosp...@xxxxxxxxxxxxx>
wrote:
The cyclist is part of both pictures, so it must be part of the
original.

Not true. Because the photos were taken from the same position, the
cyclist could have been added to either photo.

Logic dictates that if one of the two pictures is the original, and
the (same) cyclist is part of both images, it dictates that the
cyclist must have been part of the original image. Only the elements
that change between the images as you alternate between the original
and the modified version are potentially not part of the original
image.


The white bus has been edited out from one position and has been
edited in at an adjacent position.

Perhaps, but the "white bus" is from two separate images. This is
apparent by the fact that the occupants of the white bus are in
different positions in both images.

One of the white vans was part of the original picture and the other
has been copied and pasted from a nearly identical picture (where the
van and it's occupants were in a different position).
But as far as I can see there is no infallible argument that implies
which of the two vans has been edited out or was part of the original
picture. For instance, some people might falsely assume that since the
van is approaching the photographer, the picture of the van that is
nearest must be the one that has been edited in.


The question is whether the white
bus was on the left or right of the cyclist in the original picture.
You can closely examine the difference between the original and the
manipulated image by opening them in photoshop (or gimp) in a single
document with each of the pictures on a separate layer and zoom to
100% or more visibility while turning the top layer off and on or
changing the blending mode.

Yes, I will do that when I have time.

Eric Millerwww.dyesscreek.com


.

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