This button opens a file selection window. The image loaded appears in the small window to the left. You can use the check box "Overlay active" to switch the overlay function on and off.

The fader allows an overlay between live (or still) image and the overlay image of between 0 and 100%. CAUTION: The calculation of a new overlay density requires high processing power. When the overlay is active there may therefore be a delay in system response time to user entries.

The overlay has been given an additional function, which allows the image currently displayed in the Metric measurement window to be adopted as the overlay. This function is useful if you have large original images. Up till now it was only possible to load the upper left corner of a large image into the overlay. Now you first load the

image into the Metric measurement window and then move the appropriate segment

of the image in the measurement window using the sliders. Then switch to the overlay

screen and copy the current section of the image to the overlay background.