Adobe Photoshop's Marquee tool is one of the three tools which are used to make selections, the other two being the Lasso and Magic Wand. It is perhaps the most basic of the three, allowing you to make a rectangular or elliptical selection on any part of the image. As with all of the other selection tools, it can be used to make both new selections and to modify existing selections. To choose the marquee shape you wish to create, simply click on the tool and hold the mouse button down until the flyout menu appears then choose either "Rectangular" or "Elliptical".
If you are making a new selection, the modifier keys can be used to determine the behaviour the tool. If the Shift key is held down while you drag to describe the selection, the resulting selection will either be a circle or a rectangle. If you hold down the Alt key while creating the shape, the shape will be drawn outward from the point you initially click on. Naturally, you can use these two keys in combination to draw a circle or square from the centre.
You can use the same two modifier keys if you have an existing selection to determine how the selection you make will interact with the existing selection. This time, Shift is used to add to a section while Alt is used to subtract from the selection. Thus, for example, if you want to make a semi-circular selection, you could start by making a circular selection with the elliptical Marquee tool. You could then switch to the rectangular Marquee tool, hold down the Alt key and draw a rectangle which intersects one half of the circle. The area where the two shapes intersect will be subtracted from the selection.
Another useful feature is the ability to change the behaviour of the Marquee tool. You can switch from Normal mode to Constrained or Fixed Size. Thus, for example, if you were creating a series of images which all need to have a 4 by 3 aspect ratio, you could choose the Constrained option and enter 4 for the with and 3 for the height. Each selection you make with the Marquee tool will then automatically have this shape.
As well as the elliptical and rectangular shape, the Marquee tool flyout menu also allows you to choose "Single Row" and "Single Column". In this mode, simply clicking on any part of the image creates a selection one pixel high or wide going right across the image. If you zoom in, you can hold down the Shift key and click again to make it two pixels, three pixels, etc This mode is sometimes useful when restoring old photographs to select a crease in the original photograph prior to using the cloning tools to remove the flaw. - 30452
If you are making a new selection, the modifier keys can be used to determine the behaviour the tool. If the Shift key is held down while you drag to describe the selection, the resulting selection will either be a circle or a rectangle. If you hold down the Alt key while creating the shape, the shape will be drawn outward from the point you initially click on. Naturally, you can use these two keys in combination to draw a circle or square from the centre.
You can use the same two modifier keys if you have an existing selection to determine how the selection you make will interact with the existing selection. This time, Shift is used to add to a section while Alt is used to subtract from the selection. Thus, for example, if you want to make a semi-circular selection, you could start by making a circular selection with the elliptical Marquee tool. You could then switch to the rectangular Marquee tool, hold down the Alt key and draw a rectangle which intersects one half of the circle. The area where the two shapes intersect will be subtracted from the selection.
Another useful feature is the ability to change the behaviour of the Marquee tool. You can switch from Normal mode to Constrained or Fixed Size. Thus, for example, if you were creating a series of images which all need to have a 4 by 3 aspect ratio, you could choose the Constrained option and enter 4 for the with and 3 for the height. Each selection you make with the Marquee tool will then automatically have this shape.
As well as the elliptical and rectangular shape, the Marquee tool flyout menu also allows you to choose "Single Row" and "Single Column". In this mode, simply clicking on any part of the image creates a selection one pixel high or wide going right across the image. If you zoom in, you can hold down the Shift key and click again to make it two pixels, three pixels, etc This mode is sometimes useful when restoring old photographs to select a crease in the original photograph prior to using the cloning tools to remove the flaw. - 30452
About the Author:
The writer of this article is a training consultant with an independent computer training company offering Photoshop training courses as well as Adobe Acrobat training at their central London training centre.
