Apple Portables running Mac OS X 10.4.8 or later: How to use trackpad screen zooming

On Apple portables that include trackpad scrolling and are running Mac OS X 10.4.8, you can use the trackpad in addition to keyboard commands, to control screen zooming.

To zoom the image on the screen using the trackpad, hold down a modifier key and gesture with a forward finger motion on the trackpad. The reverse motion will zoom back out. (By default, the modifier key is the Control key—but this can be customized in the Keyboard & Mouse pane of System Preferences.)

Screen zooming is already set up on your Apple portable running Mac OS X 10.4.8 or later. It may even already be enabled. To personalize screen zooming:

1. Open the Keyboard & Mouse pane of System Preferences.
2. Select the Trackpad tab.
3. Select or deselect “Zoom while holding” and enter a modifier key or keys to turn zooming on or off. (To use multiple modifier keys, press them at the same time.)

There are four user-configurable options that adjust how you can move within a zoomed screen and how smooth the image will look:

• Select "Continuously with the pointer" to make the zoomed image shift continuously as you move the mouse.
• Select "Only when the pointer reaches an edge" to prevent the zoomed image from moving until you move the pointer to one edge of the screen.
• Select "So the pointer is at or near the center of the image" to keep the center point of the screen near the pointer as you move it.
• Select "Smooth images" to make the zoomed screen images appear smooth when you press Option-Command.