Exact differences between two images

I need to be able to tell the difference between two images of a pastel artwork.


The first image is of the piece, to be hung on a wall or placed on a table.


The second is a photo of the piece after it has been moved, shaken or vibrated during which time particles were moved.


I tried superimposing the two images and see the difference between the layers.  The images never seem to perfectly align along the lines of reference drawn in ink on the piece, and I do not understand the presentation of grayscale of the layer mode of difference.  I would like to know if anyone has any photographic photoshopic, or insightful ideas on how to capture this specific detail of change.  Another big challenge is now the images themselves to the exact distance and exposure to the room at the before and after photos, especially if they were taken in two different places on different dates.

Best I can think of is to load into Photoshop layers >, select the two layers and go Edit > auto alignment of layers.  Then to the blending mode of the layer from the top to the difference.

You can test so that you know what to expect by opening an image and copy the layer of BG and setting the blending mode of the layer copied the difference.  It will show as a pure black.  Now make tiny changes to the upper layer.

Tags: Photoshop

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