SELECTION WITH THE MARQUEE TOOLS[ selection part 1 ]

The marquee tools let you select rectangles, ellipses, and 1-pixel rows and columns.

Marquee tools gallery  

1. Rectangular Marquee : Makes a rectangular selection (or a square, when used with the Shift key).
2. Elliptical Marquee : Makes an elliptical selection (or a circle, when used with the Shift key).
3. Single Row or Single Column Marquee . Defines the border as a 1-pixel-wide row or column.

Selection options :

1. New selection

2. Add To selection 

3. Subtract From selection

4. Intersect With selection

How to use the tool ?

1- Select a marquee tool.

2 - Specify one of the selection options in the options bar.

3 - Specify a feathering setting in the options bar. Turn anti-aliasing on or off for the Elliptical Marquee tool.

4 - For the Rectangle Marquee tool or the Elliptical Marquee tool, choose a style in the options bar:

 Normal - Determines marquee proportions by dragging.

Fixed Ratio - Sets a height-to-width ratio. Enter values (decimal values are valid) for the aspect ratio. For example, to draw a marquee twice as wide as it is high, enter 2 for the width and 1 for the height.
Fixed Size - Specifies set values for the marquee’s height and width. Enter pixel values in whole numbers.
In addition to pixels (px) you can also use specific units such as inches (in) or centimeters (cm) in height and width values.

5 - Do one of the following to make a selection:

•With the Rectangle Marquee tool or the Elliptical Marquee tool, drag over the area you want to select.

•Hold down Shift key as you drag to constrain the marquee to a square or circle (release the mouse button before you release Shift to keep the selection shape constrained).

•To drag a marquee from its center, hold down Alt (Windows) or Option (Mac OS) after you begin dragging.

•With the Single Row or Single Column Marquee tool, click near the area you want to select, and then drag the marquee to the exact location. If no marquee is visible, increase the magnification of your image view.

**To reposition a rectangle or elliptical marquee, first drag to create the selection border, keeping the mouse button depressed. Then hold down the spacebar and continue to drag. Release the spacebar, but keep the mouse button depressed, if you need to continue adjusting the selection border.

Next tip Selection with the Lasso tool

Thanks

MR