Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I have two fairly different image files, except for a single element in the photo. Is there a procedure that can be done in Photoshop (or any other app, for that matter) to extract a mask for that element? When applied, I'd like that mask to remove the background, such that the resulting image (with transparency) can be re-used elsewhere.

Image extraction example

I can arrange one over top of the other, change the upper layer's Blending Mode to Difference, then line up the pieces and see my target appear as a black area, but that doesn't seem to get me all the way there.

share|improve this question

1 Answer 1

up vote 1 down vote accepted

There's nothing that would do that automatically and yield satisfactory results, but you could get most of the way there with a series of channel calculations.

http://help.adobe.com/en%5FUS/Photoshop/11.0/WSFC798FF0-F7E7-4792-814D-808CCC1DCBD3a.html

share|improve this answer
    
That linked video was precisely what I needed! That got me 90% of the way there, and a little more editing will clean up the rest. Thanks! –  Collin Allen Nov 23 '09 at 18:52

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.