Selecting With Rectangle and Ellipse Tools
Photoshop CS6 Tutorial
How to Make a Selection with The Rectangular Marquee and Elliptical Marquee Tools in Photoshop
Two handy tools for making selection are the Rectangular Marquee tool and Elliptical Marquee tool. Their main purpose is to select a square, rectangle, circle or ellipse.
By holding the Shift key as you drag, the shape is constrained to a circle or square. The Option key or Alt key on a PC creates the selection from the center.
Open a new document in Photoshop (File > New). Set the size to 500 pixels by 500 pixels at 72 ppi. Set Background Contents to White.
Add a square to the document with the Rectangle tool (u key). The tool options should be set to Shape layer. Hold the Shift key as you add the shape to constrain it to a square shape.
Add a circle to the document with the Ellipse tool (u key). The tool options should be set to Shape layer. Hold the Shift key as you add the shape to make it a circle.
Flatten the image by choosing Layer > Flatten Image.
Click the Rectangular Marquee tool (m key) and click-drag from the upper left corner to select the square.
Deselect the object (Cmd/d (PC - Ctrl/d) and this time press and hold the Shift key while selecting the square. The marquee is constrained to a square shape.
Deselect the object (Cmd/d (PC - Ctrl/d) and this time press and hold the Shift key and Option key (PC - Alt key). Click drag from the center of the square to one of the corners. The marquee is constrained to a square shape and starts from the center.
Repeat Steps Five, Six and Seven using the Elliptical Marquee tool (m key) to select the circle.