The auxiliary tools
Eyedropper tool. The Eyedropper tool is used for changing a foreground or background color from any open image.
To apply the Eyedropper tool, do the following:
- On the Tools menu, choose the Eyedropper tool
. - Place the cursor above the area of a color you want to change.
- Left-click to change the foreground color or right-click to change the background color.
Measure tool. The Measure tool is used for precise positioning of images or elements 
. It calculates the distance between any two points in the working area. When you measure the distance between two points, a non-printing line is drawn, and the Tools panel shows the following information:
- a. The starting point (X1 and Y1)
- b. The ending point (X2 and Y2)
- c. The horizontal (W) and vertical (H) distances between the x and y axes
- d. The total distance (L)
- e. The angle measured with respect to the axis (A)
Hand tool. Do one of the following:
- Use the window scroll bars.
- Select the Hand tool
and drag to pan over the image.
- Drag the colored box (proxy view area) in the Zoom panel.
To use the Hand tool while another tool is selected, hold down the spacebar as you drag in the image.
Zoom tool. The Zoom tool is used for zooming in/out on an image. 
Zoom in on an image by holding the A button. Zoom out by holding on the B button. To change the size of an image to the actual size, press the Actual Pixels button. To change the size of an image to the full screen size, press the Fit On Screen button.