PHOTOSHOP: How to subtract background with two identical images?

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  • Updated 3 years ago
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I have been using Photoshop for close to 9 years but this problem has me stumped. Here is the scenario:
You have two pictures. One is a background, the other is a background with a foreground object. The background in both images are absolutely identical. Pixels are identical; pixel positions are identical. How do you use the picture with only the background to subtract out the background from the picture with a foreground, leaving only the foreground object? This problem sounds really easy but I have tried masking, the subtract and divide filters to no avail. Any suggestions would be appreciated. Thank you!
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Yang Yang Li

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  • stumped

Posted 3 years ago

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Chris Cox

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There is no perfect way to do this, because of color bleed, shadows, antialiasing, transparency, etc.

Difference blend mode, followed by adjustments to create and refine a mask should get you close.