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How to replace background and retain shadows?

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  #1  
Old 06-30-2012, 03:16 PM
santoro80 santoro80 is offline
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How to replace background and retain shadows?

Sometimes I'm dealing with this situation - I have a product on a white background thats not 100% white. So I mask out the object and change backround to 100% white. Now I have background I want, but shadow of the product is gone. Is there an easy way how to replace background and retain the shadow?

I found this solution, but I when I use that "Ctrl + Alt + ~" command nothing happens. Is there other way how to do that?
http://www.sitepoint.com/keep-an-obj...-in-photoshop/

Last edited by santoro80; 06-30-2012 at 03:29 PM.
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Old 06-30-2012, 03:37 PM
ShadowLight ShadowLight is offline
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Re: How to replace background and retain shadows?

set blend mode to multiply and mask the white background (backdrop) to be visible
(shadows in this case should show up)
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Old 06-30-2012, 03:43 PM
santoro80 santoro80 is offline
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Re: How to replace background and retain shadows?

I just tried the technique from the tutorial i mentioned. It works, but it works only when the background is evenly white and thats not my case. You need to erase or unwanted shadows, but it works.
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Old 06-30-2012, 03:50 PM
santoro80 santoro80 is offline
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Re: How to replace background and retain shadows?

Shadowlight: What layer should be in multiply mode? Cant figure it out how to do it your way.
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Old 06-30-2012, 04:37 PM
ShadowLight ShadowLight is offline
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Re: How to replace background and retain shadows?

Stack:
top <masked object, blend normal>
middle <masked backdrop (white background), blend multiply>
bottom <new background>

(for the middle layer, instead of masking the whole background you can just paint-in where you need the shadows)
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Old 06-30-2012, 04:42 PM
santoro80 santoro80 is offline
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Re: How to replace background and retain shadows?

Ok, thanks. I will give it a try.
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