Epson Perfection V500 - Manual (Page 107)

To draw a marquee, move your cursor over a preview image. The pointer becomes a set of
cross-hairs.
Position the pointer in the area where you want to place the corner of your marquee and
click. Hold down the mouse button and drag the cross-hairs over the image to the opposite
corner of the desired scan area. Then release the mouse button. You see the moving
dotted line of the marquee.
Do one of the following to adjust the marquee.
To move the marquee, position your cursor inside the marquee. The pointer
becomes a hand. Click and drag the marquee to the desired location.
To resize the marquee, position your cursor over the edge or corner of the marquee.
The pointer becomes a straight or angled double-arrow. Click and drag the edge or
corner to the desired size.