Use the Zoom tool to zoom in (left-click) or zoom out (right-click) on a photo or area.

This is perfect for doing work on smaller or finer areas of a document. You can also left-click and draw a rectangle using the Zoom tool to zoom in quickly on a particular area.

Use the Pan tool to scroll or pan through an image.

This will save you a lot of time if you are zoomed in on a large document. You can access this tool at any time while working with other tools by hitting the Space bar. Whenever you hold down the Space bar, any tool you are working on will automatically become the Pan tool.