Temporarily resizes the screen buffer of the currently-selected image so that small details can be viewed. To zoom an image, click the ``zoom'' button or select ``zoom'' from the menu, then click on the image to be zoomed. Clicking with the left button makes it larger, clicking on the right button makes it smaller, and clicking with the center button restores the original size. Unclick the ``zoom'' button or click the main Cancel button to return to normal mode. The original image is not affected by zooming. Most image operations such as filtering, labels, sketch, etc. are still functional on the zoomed image. However, menus and area selection are disabled until you exit `zoom' mode by unclicking the Zoom button or clicking the main Cancel button. To restore to normal size, click the middle mouse button or select ``unzoom'' or ``undo'' from the menu. The zooming size factor can be changed in the ``Config'' dialog.
When executed in a macro or from the command editor, the amount of magnification can be specified. The ``unzoom'' command restores the original size.