How to adjust a single side of rectangular selection made with Marquee Tool?

Posted by Alex on Super User See other posts from Super User or by Alex
Published on 2012-06-23T20:43:46Z Indexed on 2012/06/23 21:18 UTC
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adobe-photoshop

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selection

I am struggling to make a selection made of different layers.

For example, a button with text and shadow (each in its own layer). I would like to copy it to a image file but it is really hard to select the shadow with a pixel precision. I do not know how to perform such task properly so I use Marquee Tool. However, it is hard to get all 4 sides right from the first attempt. What's worse, I could not find a method to adjust a single side of a selection made by Marquee Tool.

Anyone may help what I am doing wrong?

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