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In Photoshop I have a layer A which is placed onto another layer B using a multiple blend. The result looks good.

Now, I wish to hide layer B so that layer A can be saved out as a semi-transparent PNG and used on a web page which has B as a background. The alignment may not be perfect, so I don't wish to include the background in this PNG.

The problem, of course, is that as soon as I hide B layer A returns to it's original colours since there's no longer anything to multiply with. What I need is a way of fixing the result of the blend - the colour shifts that A was subjected to - such that I can remove B.

Does anyone have an idea?

Thanks,

Tim

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I'm just gonna leave this here graphicdesign.stackexchange.com/questions/10618/… –  Joonas Nov 15 '12 at 22:49
    
Can you provide a reference for the layers? The content will likely dictate the best approach. –  Marc Edwards Dec 16 '12 at 11:03
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3 Answers

I was having the same problem and I ended up used the background eraser tool. Basically the Multiply tool is getting rid of all the white in your image, this tool does the same but instead it deletes it and is not based on the layer below. Take the layer that you would have on top in your case layer A and use the background eraser tool on a low tolerance (test until you find the perfect number in my case it was about 20) then make sure its clicked to 'sampling: background swatch' and make sure your background swatch color is white. It worked quite well for me, I hope it works for you too.

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After almost 2 hours of searching I stumbled upon your solution. I can't thank you enough! –  Niloct Apr 3 '13 at 1:47
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Instead of a blending mode, try using opacity on layer A. It is limiting, but you can export it out as a PNG and it will work when overlayed on the website.

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Basically, you merge visible then mask or remove anything not effected by the blend mode.

This question asks a similar thing involving Overlay mode. Same solution though. Photoshop — convert 'overlay' layer to normal

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Hi. That technique would fix the background image into the result, whereas I need to maintain the transparency so that I can position it on another background. Essentially I need to keep only the colour shifts that occur. –  tarmes Oct 19 '12 at 6:17
    
That is not possible. In order for blending modes to work there must be layers of pixels. There is no feasible way to have a blend mode alter anything with only a single layer. None. I still think this technique I posted may work. Can you add a sample image to your question? –  Scott Oct 19 '12 at 7:28
    
Another option would be use the eyedropper to pick up the resulting color, then apply that color to an independent layer in the necessary shape. –  Scott Oct 19 '12 at 7:39
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