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How to match scale of the exact same object that appears in 2 images with different dimensions?

Let me explain my use case: enter image description here

  • There once was a hi-res photo of a Cat (original)
  • Someone cropped it (image A)
  • Another person cropped another part of it & downscaled the photo (image B)

I don't have the original photo anymore, only image A & B.

If image B wasn't downscaled, it would be easy to pixel match & combine them. But that's not the case here.

Other than manually using the Transform tool to try & approximate the scale, is there a way to stitch the images in a more 'pixel perfect' way? Given that I know its the exact same object in two photos, just that the dimensions & scale are different.

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You can do this automatically by using the Photomerge feature in Photoshop. The images do not have to be the same size for this to work.

  1. File -> Automate -> Photomerge

  2. Choose Auto for the Layout

  3. Browse for your images that you would like to merge

  4. Press OK. Photoshop will create a new document with the merged images.

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