Pan - Zoom

Pan

An image displayed on the screen will always be centered on it's focus point. When the image is initially loaded (or reloaded) the focus point is set to the center of the image.

Panning is obtained by clicking on the 'focus' button at the upper left coner of the screen and subsequently clicking on the desired new focus point. This will define a new focus point.

Zoom

Pressing the 'zoom +' button will magnify the image by a factor of two (by simple pixel duplication). The magnified image will be centered at the current focus point

Pressing the 'zoom -' button will shrink the image by a factor of two (using every other pixel only). The shrinked image will be centered at the current focus point. This feature is usefull if you want an overview of the area covered by a small image. Vector graphics will be drawn to the full screen image area is available.