At the Navigator panel the whole image is displayed. By that, the visible part is marked by the red rectangle. By moving the rectangle in the Navigator panel in the image window a chosen fragment of the image shall be displayed. The moving of the rectangle is carried out with the help of the mouse by the pressed left button.
allows to select the scale value in per cent from the offered variants or to enter the necessary scale in per cent. The slider allows to change the scale smoothly,
zooms the image in by one step,
zooms the image out by one step.