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One of the interesting options available for modifying the shape of a selection is the border option. Let's take a look at how you might utilize this option. I'll get started by creating a selection, in this case, using the rectangular marquee tool. And so, I'll choose the rectangular marquee tool from the toolbox, and then I'll click and drag in order to define a selection. In this case, just a selection near the edge of the overall image. And so I have a selection of the central portion of the image, and of course the area outside that selection is not selected.
And so if I were to apply an adjustment I would only be effecting this specific area, the inner portion of the image. But what if I wanted to have a band that goes around this area, in other words the selection that borders either side of this existing selection, the edge of that selection. Well that's where the border option for modifying a selection comes in. I'll go to the Select menu and then choose Modify followed by Border. That will bring up the Border Selection dialogue where I can enter a width in pixels.
I'll just type ten for example, so I can have a ten pixel wide border. That is centered on my existing selection edge. I'll go ahead and click the okay button and now you can see that I have a border selection, a selection that encompasses the area surrounding the edge of the selection I created initially. And so if I were to apply an adjustment, for example it would affect only that small area. I'll illustrate that by adding an adjustment layer, in this case just the curve's adjustment layer and you can see that I'm able to apply an adjustment to just that border area. So, an interesting and sometimes a useful option for modifying an existing selection creating a border selection along the edge of that initial selection.
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