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There's a variety of different ways that you can add edge effects to your images. One of my favorite ways is to use either a scan of an edge of paper or take a photograph of it. So, I have two images open right now, this Magnolia and the PaperEdge. I'll go under Window and then Arrange, and let's tile these 2-Up vertically. What I want to do is I want to use the edge of this piece of paper right here. And the way that I created this file was I simply took a piece of watercolor paper and tore the paper into strips. I then set those strips down on the scanner. And if you just leave the scanner lid open, the way that the scanner works is that as it scans the paper, the light will actually fall off between the scanned paper and the ceiling, and so you get a black background.
But I could have also taken a picture of the strips of paper on just a black background. I'll select my Marquee tool and then click and drag to select this edge. I'll then use my Move tool to move this edge into the Magnolia file, and I'll scoot it over to the edge. Now, depending on whether or not you want a black edge or a white edge is really the difference between just changing one or two things. So let's set up the file first and then I'll show you the blend mode you need in order to get the edge that you want. I'll duplicate this edge by using Command+J and Ctrl+J, and then we'll free transform it.
I'll right-mouse-click inside the free transformation boundary and I'll flip this horizontally. Then I can move it over to the other side. I just want to make sure that for now there is black going around all of the edges. I'll tap Enter or Return to transform it and then use Command+J or Ctrl+J again to make another duplicate. We'll transform this as well, by positioning my cursor outside the transformation bounding box. I can click and drag, and if I hold down the Shift key, we can automatically snap to 15-degree increments.
So, I'll go ahead and snap this to 90 degrees and move it to the top of my image. I'll tap Return or Enter in order to apply that, and then I'll do it again, Command+J to duplicate, Command+T, right-mouse-click to flip vertically, and position that at the bottom. Now, I need to change the blend mode of all four of these layers, so I'll select them all in the Layers panel and then change the blend mode to Multiply. When I select Multiply, all of the white will disappear, because white is the neutral color in the Multiply blend mode. So now we can see that I have my black edges. Just as easily, I can do the reverse and get white edges.
Let's go ahead and undo that so that all the blend modes are in Normal mode again, and I'll select the first layer and then choose Image > Adjustments > Invert, or Command+I or Ctrl+I. That inverted the bottom layer. I'll select the next one, Command+I, the next one, Command+I, and one more time. Now we can select all of these layers and change the blend mode to Screen. If I choose Screen, all of the white remains and all of the black disappears. So there you have it, a very quick way to add a unique edge to your image.
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