Using the Magic Wand Options Bar in Photoshop

The three remaining options are as follows:
-->Contiguous: When you turn on this option, the Magic Wand tool selects only pixels that are adjacent to each other. If you turn off the option, the Magic Wand tool looks throughout the image and selects all pixels within the range of Tolerance, whether or not they’re adjacent to each other.

-->Use All Layers: This option is valid only when you have multiple layers in your image. If you have multiple layers and this option is on, the Magic Wand tool selects color from all visible layers. If you turn off this option, the Magic Wand selects colors from the active layer only.

-->Sample Size: Although this option affects the Magic Wand tool, it appears in the Options bar only when you’ve selected the Eyedropper tool. Select the Eyedropper tool and, in the Sample Size pop-up menu that appears, choose from the following:

- Point Sample: Samples just the color of the pixel you clicked
-3 by 3 Average: Averages the color of the pixel you clicked and the surrounding 8 pixels
-5 by 5 Average: Averages the color of the pixel you clicked and the surrounding 24 pixels.