When the zoom tool is selected, the cursor becomes a magnifying glass with a plus sign. The plus sign indicates that you're all set to zoom in. All you need to do is click to increase magnification. If you want to zoom in on a specific area of the image click and drag a rectangle around the area you want to magnify. This will enlarge the selected area to fill the workspace. Try it now. To return to 100% magnification, use the keyboard shortcut, Ctrl-Alt-0 (Win) or Cmd-Option-0 (Mac). To zoom in without switching to the zoom tool, use Ctrl-+ (plus sign) on Windows or Command-+ (plus sign) on Macintosh.
To switch to zoom out mode, you can click the zoom out button on the options bar. However, it is much easier to use the keyboard shortcuts. When you hold down the Alt (Win) or Option (Mac) key, the zoom cursor will change to a minus sign in the magnifying glass, and you can click to zoom out. To zoom out without switching to the zoom tool, use Ctrl-- (minus sign) on Windows or Cmd-- (minus sign) on Macintosh.
Let's review each of the zoom tool options:
- No modifier key = click to zoom in; click and drag to zoom into a specific area
- Double click zoom tool button = zoom to 100% magnification
- Ctrl-Alt-0 (Win) / Cmd-Option-0 (Mac) = zoom to 100% magnification
- Alt (Win) / Option (Mac) = click to zoom out
- Ctrl-0 (Win) / Cmd-0 (Mac) = zoom to fit the screen
- Ctrl (Win) / Cmd (Mac) = temporarily toggles to the move tool

