As we saw in the last tutorial, you can certainly add canvas size around your images in the Crop tool, but there are times when you might want to be a little bit more specific and add, say, for example, an inch to the side or to the top of your image. If that's the case, then I would suggest we go to Image and then Canvas Size. We want to add 1 inch to the left- and right-hand side. Then our total inches for Width would turn to 8. If we wanted to add 1 inch at the top but maybe 2 inches at the bottom, then I need to change my Height to 7.
Now, by default, Photoshop is going to anchor the original photo right in the middle. Of course, I can change that by clicking in any of these grid squares. If I do this on a background layer, which is what I have right now, Photoshop has to fill this additional canvas with a color. I can choose my color right here if I wanted to change it, or I could select it from the list here. When I select Other, it would also take me to the color picker. So a more flexible way to do this might be to cancel out and before using Image Size, turn your background into a layer.
The easiest way to do this is to choose Layer > New > Layer from Background. I'll call this ice, click OK, and now when I go to Image > Canvas Size, you can see that if I change my numeric values to 8 and 7, I don't have the option to pick a background color, because Photoshop will automatically create transparency around the area. There's another option in this dialog box.
I can simply add a relative amount of space around my image. By checking that on, I can now change, for example, the width and height to 2 x 2. You have to be a little careful here. Because it's relative, it's going to add 1 inch on each side. So if I wanted to actually add 2 inches on each side, I would need to change these values to 4, but I'm going to just add 1 inch, so we'll leave it set at 2. When I click OK, you can see that Photoshop has added an inch of transparency all the way around my image.
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