Zoom
lets you create zoom areas.

Circle | Rectangle | Triangle

Preview Cross | Right click on the preview to set the position of the zoom area.
Zoom Factor Slider | A value of 2 means that the zoom area displays the image part beneath it at double size, a value of 3 at triple size etc. At a value of 1, there will be no zoom effect, only the zoom edge will appear.
Circle Size Slider | Defines the size of the zoom area.
Circle Edge Slider | Let's you set the size of the zoom edge. A value of zero means that there will be no edge visible.
Color Box | Clicking on it will pop up a color dialog for selecting the color of the zoom edge.
Interpolate Check Box | If this check box is deactivated, the zoom area will have a mosaic effect. If it is activated, the zoom area will look more even.