6.3.  Magnify Tool

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Revision $Revision: 1985 $ 2006-02-23 j.h

Figure 12.81.  Zoom tool

Zoom tool

The Magnify Tool is used to change the zoom level of your working image. If you only click on the image, the zoom is applied to the whole image. But you can also click-and-drag the mouse pointer to create a zoom rectangle. Then, the action of this rectangle is better understood if the “Allow window resizing” option is unchecked: you can see that the content of this rectangle will be enlarged or reduced so that its biggest dimension fit the corresponding dimension of the image window (if the biggest dimension of the rectangle is width, then it will fit the width of the image window).

6.3.1.  Activate Tool

  • You can get to the Magnify Tool from the image-menu through : ToolsMagnify,

  • or by clicking the tool icon: in Toolbox.

6.3.2.  Key modifiers (Defaults)


Holding Ctrl when clicking on a point of your image will change the zoom direction from zooming in to zooming out.

6.3.3.  Options

Figure 12.82.  Zoom tool options

Zoom tool options


The available tool options for Magnify can be accessed by double clicking the Magnify tool icon.

Allow Window Resizing

This option will allow the window containing your image to be resized if the zoom level dictates it.

Tool Toggle

The two available tool toggles are used for changing the zoom direction between zooming in and zooming out.


This option sets the size that a dragged zoom rectangle must be before zooming to that rectangle actually occurs. A higher Threshold will require a larger rectangle before zooming to that rectangle happens. With a low level, a very small rectangle will push you towards a more than 2000% zoom level.

6.3.4.  Zoom menu

Using the Magnify tool is not the only way to zoom an image. The Zoom menu provides access to several functions for changing the image magnification level. For example, you can easily choose an exact magnification level from this menu.