Zoom tool options

In this palette of options associated with the zoom tool you'll find the following two shortcut buttons :

• Fit on screen (Alt + S) Scale the zoom percentage and window size to the largest that can fit on your monitor and still contain the entire image.
• Actual pixels (Alt + A). This option is nothing but a shortcut to display an image at 100%. One pixel of the image being displayed by one pixel of the screen.