The marquee selection tools allow you to create selections based on standard geometric shapes, such as ellipses and rectangles.
A selection performed using the Elliptical Marquee tool.
Selection tools
There are several marquee tools you can use to create pixel selections:
Rectangular Marquee Tool—creates a rectangular or square selection.
Elliptical Marquee Tool—creates an elliptical or circular selection.
Row Marquee Tool—creates a rectangular selection of a set pixel height which spans the entire image's width.
Column Marquee Tool—creates a rectangular selection of a set pixel width which spans the entire image's height.
To create a pixel selection:
With one of the above marquee selection tool selected, drag on your page.
To set the width of a row/column selection:
With the Row Marquee Tool or Column Marquee Tool selected, adjust the Height or Width , respectively, by either dragging on the vertical slider or by tapping on the number. Then simply enter the precise value and parameter.