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There are many times when you want to act on just part of a photograph. If you don't have layers in the image, it's difficult to act upon just part of a photo, and that's where selections come in. Selections allow you to isolate part of an image and work on just that part. Here for example I'd like to change the color of this pink balloon, but leave everything else in the image the same. In order to fill just the pink balloon with a different color without affecting the entire image, I need to select the pink balloon. There are lots of different selection tools, which I'll cover in the movies to come.
For now I'm going to use one of my favorites and that's this tool, the Quick Selection tool. I'll select it from the toolbar, and then I'll come into the image and I'm going to make my brush smaller, because this tool seems to work better with a small brush. So I'll press the Left Bracket key on the keyboard a few times. Then I'm just going to click-and-drag over that pink balloon and in just a second, the Quick Selection tool selects that balloon based on its color and its tone. Now, when I take some kind of action on the image, it will affect only the selected area. For example, to change the color of that balloon I'll go up to the Edit menu and I'll choose Fill Selection.
That opens the Fill Layer dialog box. I'll move that over by clicking in its title bar and dragging. Here I can choose what color to fill the selection with. I'll click that menu and I could choose whatever color is in the foreground or background color boxes, Black, Gray, or White, a pattern or if I click color like this, that opens the Color Picker where I can select a color and click OK. I'm also going to change the blending mode, which will affect the way that the color with which I'm going to fill will blend with the tones in the image below.
If I left this at Normal, the fill would be all one solid color and I want to keep the highlights and the dark areas of the balloons so that it still looks like a photograph. So I'll click the Blending Mode menu and I'm going to try the Multiply blend mode. Then I'll click OK. That fills just the selected area with color. Now, I want to eliminate the animated dashes that represent the selection. They are called the marching ants by the way. To deselect, I'll go up to the Select menu at the top of the screen and I'll choose Deselect and take note of the keyboard shortcut for deselecting a selection, because you'll use it over and over, and that's Ctrl+D on the keyboard.
So the beauty of selections is that they allow you to work on just part of an image without affecting the rest of the image.
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