To change the size of the image with the Zoom tool, first enter a value in the text field next to the buttons.
You can type the value, use the abbreviated menu buttons, or use the sliders. Figure 13-11 shows the Zoom icon and an image that has been enlarged by 25%.
To cancel unsatisfactory changes:
For the most recent single change (panning, flipping, rotating, or zooming), choose Undo from the Edit menu.
For multiple changes, click SELECT on Revert. This restores the last saved version of the image.