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In this chapter, we are going to take a look at Selection tools, and within the world of digital imaging, selecting an area of that image is a very useful tool and it's in fact used all the time for all kinds of different activities. For example, you may want to select something out of an image. You may want to change a color within an image. You may want to make a copy of something in an image. All of these things require first creating a selection in order to do those kinds of activities.
And so, I am going to go through and show you those in this chapter. I am going to begin however, with just the humble Rectangular Selection tool. This is the simplest of selection tools. It simply makes a rectangular selection. To show you how this works, once I've got a rectangular selection, I am going to take my airbrush here and just draw in it. So the first and foremost aspect of what a selection tool does is, it isolates an area. So now that that selection is in place, I can do different things inside of it and it won't affect any other area.
Of course, we have undo, so I can get back from that so it's not permanent on my image. The other thing I can do is, I can use the Invert command, which if I go right here, Invert Selection, and now it's going to let me do something on that image. It's going to let me affect everything, but what my original selection was. Because as you can see now, the so-called marching ants are now on the outside of what the original selection was. If we go back to selection, and Invert that again, you can see now it doesn't look any different here, but there's no longer a selection on the outside.
So we can flip the meaning of the selection anytime we want with the Invert Selection command. Now once again, I am going to undo here, get back to my selection as it originally was, and another thing that is possible here is you can add to and subtract from selection. So I am going to continue to use the Rectangular Selection at this point to show you this, but if I hold down the Shift key, you will see a little Plus shows up next to my icon, that allows me to go in now and I can start to build a larger selection with this particular Additive Selection mode we are in.
Conversely, if I hold down the Option key or the Alt key on Windows, you will see now there is a negative sign on there. That allows me to go in, and in this case like punch a hole right in the center of that. So, just using this one tool and the fact that I can toggle back and forth between creating this selection, adding to a selection, subtracting from the selection, makes it very easy to start to get a rather complex shape. And once again, if I go back to my airbrush, and just paint in here, you can see I have made a fairly complex shape just out of rectangular selections that are carving into and adding to my initial selection.
So that's yet another basic feature of selection, the ability to add to and subtract from it. And as we go forward, you will see how very useful that is. I'm showing you right now the most simplest of selection mode here, just with a rectangular selection, but in the next video, I am going to go on and we are going to start dealing with some of the subject matter, that's actually on the image behind this here.
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