Pan - Zoom
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.
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
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.