The color picker tool allows you select a certain color and use it again instead of trying to match the color yourself using other methods.
How you would use this is, first you can go into the tool box window and select the eye dropper icon witch is the color picker. Then you move your mouse over the color you want and left click on it now that color will show up in your foreground and background color box under all the tools. another way to do this is you can click the foreground or background color box and then a window with a bunch of
colors show up and there is the eye dropper and you just repeat the same steps.
How you would use this is, first you can go into the tool box window and select the eye dropper icon witch is the color picker. Then you move your mouse over the color you want and left click on it now that color will show up in your foreground and background color box under all the tools. another way to do this is you can click the foreground or background color box and then a window with a bunch of
colors show up and there is the eye dropper and you just repeat the same steps.