To scan an image, the user can start with a preview scan and then select the part of the scan area to do the final scan on. The preview scan is started by pressing the preview button.

The Preview Button

When the preview is scanned the area for the final image can be selected.

Selection and zoom

To better select the image the user can zoom in, out, to the current selection or zoom to fit the whole preview to the window.

The "zoom to fit" button

When the image is selected the final image can be acquired by pressing the final scan button.

The final scan button

You will see the progress of the scan.

Scanning in progress