Photoshop provides keyboard shortcuts for zooming the view, for working with view items, and for viewing images.
Windows [Ctrl]-[+], Mac [ z ]-[+]
Zoom in
Press this shortcut multiple times to zoom in as far as necessary.
Windows [Ctrl]-[-], Mac [ z ]-[-]
Zoom out
Press this shortcut multiple times to zoom out as far as necessary.
Windows [Ctrl]-[0], Mac [ z ]-[0]
Zoom the image to fit on screen
The Fit On Screen command (which you can also choose from the View menu) zooms the image to the largest size at which the whole image fits on the screen. You can also invoke this command by double-clicking the Hand tool.
Windows [Ctrl]-[Alt]-[0], Mac [ z ]-[Option]-[0]
Display the image at 100 percent size
This shortcut is the equivalent of the View Active Pixels command.
Windows [Ctrl]-[Spacebar], Mac [ z ]-[Spacebar]
Temporarily activate the Zoom In tool
Hold down this shortcut to activate the Zoom In tool, and then click to zoom in.
Windows [Alt]-[Spacebar], Mac [Option]-[Spacebar]
Temporarily activate the Zoom Out tool
Hold down this shortcut to activate the Zoom Out tool, and then click to zoom out.
Windows [Ctrl]-drag, Mac [ z ]-drag
Zoom in on a particular area of an image
[Ctrl]-drag (in Windows) or [ z ]-drag (on the Mac) over the area of the preview in the Navigator palette.
Windows [Ctrl]-[Y], Mac [ z ]-[Y]
Toggle Proof Colors on and off
Windows [Ctrl]-[Shift]-[Y], Mac [ z ]-[Shift]-[Y]
Toggle Gamut Warning on and off
When you turn Gamut Warning on by pressing this shortcut or by choosing View Gamut Warning, Photoshop highlights all pixels that contain out-of-gamut colors.
Windows [Ctrl]-[H], Mac [ z ]-[H]
Toggle the display of all extras
Extras are nonprinting items such as the grid, guides, target paths, annotations, and selection edges. Instead of turning on the display of all extras, you can turn on the display of only that extra you need.
Windows [Ctrl]-[R], Mac [ z ]-[R]
Toggle the display of the vertical and horizontal rulers
Windows [Ctrl]-[Shift]-[;], Mac [ z ]-[Shift]-[;]
Enable or disable snapping
Windows [Ctrl]-[Alt]-[;], Mac [ z ]-[Option]-[;]
Toggle the locking on guides
Lock guides when you want to make sure that you don t move them accidentally .
Windows [Ctrl]-[Shift]-[H], Mac [ z ]-[Shift]-[H]
Toggle the display of the target path
The target path displays all the anchor points, direction lines, and direction points for the selected object.
Windows [Ctrl]-['], Mac [ z ]-[']
Toggle the display of the grid
Windows [Ctrl]-[Tab], Mac [Ctrl]-[Tab]
Cycle through the open images
Windows [Q], Mac [Q]
Toggle between Standard Edit mode and Quick Mask mode
Windows [F], Mac [F]
Switch among Standard Screen mode, Full Screen mode with menu bar, and Full Screen mode
Windows [PageUp], Mac [PageUp]
Scroll up one screen
Windows [PageDown], Mac [PageDown]
Scroll down one screen
Windows [Shift]-[PageUp], Mac [Shift]-[PageUp]
Scroll up ten units
Windows [Shift]-[PageDown], Mac [Shift]-[PageDown]
Scroll down ten units
Windows [Home], Mac [Home]
Move the view to the upper-left corner of the image
Windows [End], Mac [End]
Move the view to the lower-right corner of the image