Re: Moving an image around until it exactly matches another one underneath

Joel <Joel@xxxxxxxxxx> wrote:

Actually, if both scans are exactly the same size, you may not have to
move the layers around at all.

If you set the top layer to Difference, the pixels that are identical
will turn black. So, when the layers are perfectly aligned the whole
image will be black except for any parts that are different, which makes
the differences easy to pick out.

It is unlikely that this will work with two different scans. Even if the
images are the same size, there will be scanning differences which are
irrelevant for what the OP is looking for, but will interfere in this
process.

I don't see why 2 scans can't line up to each other, even with different
DPI. Cuz the only different would be quality, size (you have option to fit
the canvas) which wouldn't cause much or any problem.

Cuz one of several tricks to remove the old film gain from old photo is
scanning the photo (1) top-to-bottom (2) bottom-to-top to get different
result from the light-movement of the scanner, then rotate 1 photo then
blend 2 scans together etc..

Cuz the originals are two different printed documents, and then scanned
individually. It's unlikely that these will give you pixel perfect
copies of eachother, because both the printer and the scanner has
certain tolerances. Most likely the scans will be ever so slightly
different, making it impossible to align all the text pixel perfect. You
can align some of the text, but then another part will be slightly
misaligned. For an old photo that isn't so important, because it will
only slightly blur the blended result. But to see the difference between
the scans by using the 'Difference' layer mode, you need pixel perfect
alignment.


--
Johan W. Elzenga johan<<at>>johanfoto.nl
Editor / Photographer http://www.johanfoto.com
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