Magic Wand
The Magic Wand tool allows you to select an area containing similar or matching colour, or an area bounded by similar colours.
To use this tool...
Click on the Magic Wand button and position the crosshairs of the cursor over the area of the image to be selected. Click once with the left mouse button to select the area bounded by similar colours. The area of the selection can be adjusted by changing the wand's tolerance or by repositioning the cursor.