The color range select tool is another powerful and quite flexible selection tool available in Photoshop.. The color range selection tool allows you to make a selection in a color and value range, hence it's name

Under the selection menu you will find the color range selection tool. With an image open, go ahead and click on the color range selection tool. A small window will pop up showing your image. Now if you go ahead and roll over your actual image or the preview that has popped up you will notice you have the eyedropper tool, go ahead and click somewhere in your image. (check to make sure the selection radio button is selected beneath the preview window for this example.)

Notice the preview image showing your selection in grayscale. Now you have a few choices here...