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In this chapter, we're going to take a look at selections. Selections are the primary tool for isolating areas of your canvas. Whether you want to selectively paint, or create a layer element, or apply an effect to a specific area. Selections are just the ticket. Let's take a look. Selections are basically a way to isolate an area of an image and we're going to use this image on the screen as our example throughout this chapter. But the first thing we want to do is actually get a selection and the kind of most basic selection in the Tool palette is the venerable Rectangular Selection.
Once I've selected that tool, I can essentially click and drag to create an area that is now selected. And just as an example, if I temporarily grab my brush, you'll see now that with this Airbrush for example, it's isolating the area where I can work on screen. So first and foremost a selection acts as somewhat of a mask. So that only those particular areas can be affected. Now, there are a couple basics here you want to understand about selections. I'm going back to my Selection tool here. I can add and subtract from a selection.
And if I hold down my Shift key, you'll see that a small plus sign appears on the cursor. Now, when I create a selection, it's added to the current selection. As long as you're holding the Shift key down, you can continue to add to a selection. Conversely, if I hold down my Option or Alt key, I can subtract from a selection. So now we see a little minus on there and I can even punch a hole, for example, into my selection. So, this let's me, the combination of the Shift to add and the Alt or Option key to subtract, allows me to build more than just a Rectangular Selection with even a simple tool like the Rectangular Selection tool.
And this generally applies to the various selection tools we're going to be looking at. You have the capability to both add as well as subtract from a selection. So this is just the basis for selections. It's an area that isolates or defines a particular area on the image and from there you can use it for variety of tasks, which we'll be exploring here throughout the rest of the videos in this chapter.
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