The eye dropper tool is used to pick up a color value from the canvas. This is a very useful tool because there will be many times when you want to switch colors while painting to a color already on your canvas and you do not want to go all the way through the color chooser dialog. In these cases, simply click on the eye dropper tool in the toolbox and click on the color you want to select inside the canvas. When you do so, your foreground color in your color boxes will change to the selected color.

he eye dropper tool has a single option which allows you to pick up the exact color or an average of the colors around it. Try it out and see how easy it is to use.