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Once you've made a selection, you can modify its shape, adding to it, subtracting from it, intersecting it, or using the Grow and Similar commands to select more. To show you this, I am going to zoom in on this image, selecting the Zoom tool, and clicking the 1:1 button in the Options Bar. And then I'm going to get the Rectangular Marquee tool. I will click and drag a selection, because I want to show you that when I click outside that selection, the selection disappears, and that's because by default this icon is selected in the Options Bar, the New Selection icon.
So each time I click, Elements tries to make a new selection for me, and dismisses the old one. I am going to make a selection again, clicking and dragging inside of this horizontal part of the window. Now let's say that I also want to select the vertical part of the window, so that my selection is in the shape of a cross. To do that I need to add to the initial selection. So I'll go up to the Options Bar and I will click the second icon, the Add To Selection icon. And now when I come into the image and click, my first selection doesn't disappear, instead when I drag out another selection, that is added to the original and I get this compound selection.
An additional selection doesn't have to be adjacent to the initial one, it can be elsewhere. So if I also come over here and click and drag, this part of the selection will be added to the original as well. There's also a Subtract from Selection button in the Options Bar and that's here. I will select that, and then I will come into the image, and I will click and drag over a part of my selection to remove that part from the selection as a whole. I will come back in and I'll get the rest of this, and remove that as well.
Subtract from Selection comes in handy if you mistakenly select a little bit too much and you just need to trim that piece away. The next icon is the Intersection Selection icon. With this icon selected, if I come into an image and draw a selection over a part of an initial selection, the only areas selected will be those that intersect the two selections. That's a lot of words. Let me show you what it does. I am going to come here and click and drag just over the horizontal part of this selection, and now all that remains selected is the area that intersects both my initial selection, and the one that I just drew.
The options that I just showed you up here in the Options Bar for the Rectangular Marquee tool are available for all the other selection tools too with the exception of one, the Quick Selection tool which has different options. I'd like to switch to another image by double-clicking it in the Project Bin, because I want to show you another way that you can modify a selection, and that is to use the Grow and Similar commands under the Select menu. I am going to select the Regular Lasso tool, and come into the image, and just click and drag over part of the blue sky.
I'd like to select all of the blue sky in this image. But you can see that, that would require a lot of work if I try to do it manually. In fact, it probably would be impossible because there are little bits of blue sky showing between all these intricate leaves. So here's what I am going to do instead. I'll go up to the Select menu and I will go down and choose Grow. When I do, that initial selection automatically expands to the rest of the blue sky that's adjacent to my initial selection.
Now it doesn't include these other parts of the blue sky that are separated from this contained area. So if I want to include those parts of the sky as well, I'll go up to the Select menu and this time, I'll choose Similar rather than Grow, and that selects almost all the blue sky in the image. There may be a few little parts to clean up like here and here, I can do that with the Lasso tool, clicking the Add to Selection button, and just coming in, and adding this small bit to the selection. I will also click and drag here to add this part to the selection.
And if I selected too much, I could use the Subtract from Selection icon to remove that. So those are all very useful features for modifying your initial selection.
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