How do I get the difference between 2 images | Adobe Photoshop | Page 1

faint gulch Apr 17, 2025, 1:15 PM

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I have one image, and another image that is exactly the same as the original, except this has a new thing merged. So both images are the same except for that new added thing. I want to substract both images so I only get that new thing in a new layer.

How do I get this?

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I want to end up with this

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but the images are merged in the second layer, thats the problem

steel marsh Apr 17, 2025, 2:27 PM

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Put both images in the same document, align them perfectly and change the blend mode of the top layer to difference. The untouched pixels will be black, select the black to mask the duck.

faint gulch Apr 17, 2025, 2:31 PM

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steel marsh Put both images in the same document, align them perfectly and change the blend ...

I already did that but the layer is shown in neon colours for some reason

steel marsh Apr 17, 2025, 2:39 PM

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Are they of the same resolution, same color profile? Are they perfectly registered?

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Difference and not hard mix mode?

faint gulch Apr 17, 2025, 2:44 PM

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same resolution same color

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its getting detected the difference (background becomes black) its just that the duck doesnt look right

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looks like this

steel marsh Apr 17, 2025, 2:50 PM

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Yes, select the black, and use it to mask the duck.(you could even run treshold to get b&w)

faint gulch Apr 17, 2025, 2:50 PM

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with magic wand?

steel marsh Apr 17, 2025, 2:52 PM

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For instance.
Or, If you add treshold and change the middle point, you could select all, copy, open a copy of the image with the duck, add a layer mask, alt+click the layer mask thumbnail and paste.

faint gulch Apr 17, 2025, 2:55 PM

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removing background button seems to work

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let me test with another image

steel marsh Apr 17, 2025, 3:06 PM

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faint gulch looks like this

Btw, that result of neon Colors is expected.

faint gulch Apr 17, 2025, 3:07 PM

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uh I cant make it work for another image

faint gulch Apr 17, 2025, 3:07 PM

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steel marsh Btw, that result of neon Colors is expected.

it confuses me a bit

steel marsh Apr 17, 2025, 3:09 PM

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faint gulch removing background button seems to work

No, similar colors are black and the duck is colored based on the difference in color (for each channel) with the other image. Some of the grey color in the wings is almost the same as the clouds, so it is dark grey.

https://photoshoptrainingchannel.com/blending-modes-explained/#:~:text=create the blend.-,Difference,or Command I (macOS).