Use this command to reduce the active image by a factor of 2. To utilize "context zoom" feature, position the cursor over an area of interest in the image and press the "-" key. ImageWarp will attempt to keep the pointed area in the center of the image frame while reducing the image. You can also indicate an area of interest for zoom by using the Selection tools. If no selection is present and the cursor is outside of the active frame, the center of the image will be assigned an area of interest.
Note that Zoom commands do not change the content of the image, but only its appearance in the image frame. To change the actual size of the image, use Resize command in the Edit menu.