The Zoom tool allows you to zoom in on a selected area of an image. Double click on the image to return it to normal size.
If you wish to maintain a zoom across several images (i.e. zoom to the same region on each page), hold down the SHIFT key while drawing your zoom rectangle. Each image loaded will then zoom to the same region automatically.
Note - the zoom range is only maintained across images with the same dimensions. If a page changes from Portrait to Landscape, the zoom area may be incorrect.
To restore the zoom to normal, double click on the image.
Tip - rotating, loading and re-sizing will always reset the image. If you plan to add annotations to a zoomed region, rotate and re-size the image first, then apply the annotations.