Photoshop Totorial Marquee Tool Basics ...EFECTOS
Marquee Tool
The Marquee tool is the most basic of selection tools and often the one most useful. This tool is used to draw selections based on geometric shapes. Specifically, the marquee tool allows you to draw rectangular and elliptical selections. To form the selection, simply click and drag the mouse.
Open the image you want to edit in Photoshop.
Select the marquee tool in the Photoshop toolbar. It's the second down, below the move tool. To access the four options of the marquee, hold the left mouse key down on the tool, and select one of the additional options from the pop-up menu.
Select an area of the image to work with. Position the mouse where you want to begin the selection and click the left mouse button, holding it down while you drag the selection to the desired size.
For the elliptical and rectangular marquees, hold Shift to make perfect circles and squares.
For the single row and single column marquees, click and drag the marquee to select the one-pixel line of your choice.
To move the selection while you're still creating it, hold down the spacebar and drag the mouse; the selection will move instead of resizing. To continue to resize, release the spacebar.
When you've selected everything you want, click and drag to move the selection area. You can also nudge it using the arrow keys.
New selection: You'll start a completely new shape.
Add to selection: If you make one selection and click again, the two areas will join together if they overlap. You can also use this option by holding Shift before you make the next selection.
Subtract from selection: The second shape you create will remove itself from the first (i.e., placing a circle inside another circle will create a selection the shape of a doughnut). You can also subtract one selection from another by holding the Alt or Option key before you start making the second shape.
Intersect from selection: Making multiple shapes will give you a selection based on where they overlap.
Feather lets you create a softer border for your selection area. Enter a value from 0 to 250 to set how far out you want to blur the selection beyond the line you select.
The Anti-alias box tells Photoshop whether to "smooth" the borders of a selection. This setting is useful when you're working with low-resolution images.
The Style pulldown menu lets you decide how the shapes behave when you use the elliptical or rectangular tools.
Normal means that the ellipse or rectangle will follow your mouse pointer exactly.
Fixed ratio lets you decide the relative dimensions of the width and height of your selection. For example, enter 2 and 1 to always make ellipses and rectangles twice as wide as they are tall.
Fixed dimension means that every time you click, you'll create a specific size of a shape. Enter the height and width in pixels to set these values.
Putting the Selections to Use
Once you have selected an area, you can apply different uses to it. Use a Photoshop filter, and it will only apply to the selection. Cut, copy, and paste to use it elsewhere or alter your image.
You can also use many of the functions within the Edit menu, such as fill, stroke, or transform, to alter the spot you've selected. Create a new layer, and then fill a selection to build shapes. Once you learn the marquee tools, you'll be able to manipulate not just the whole, but parts, of your images.