Scaling X-ray images
If the image has not been previously scaled, an image scaling window will appear:
During scaling, a mark-up will appear:
Drag both its ends to the points corresponding to both tips of three-centimetre scale (or other, if you changed it in the panel on the left). An alternative way is to click the tips of the scale in the picture – the ends of the mark-up will set up automatically.
On some computers (for instance, on those with enlarged system text) the may not be displayed. In this case, the mark-up can be set by clicking the tips of the cephalometric image scale.