The pen tool allows you to draw on the image. This is useful for erasing smudges, filling in missing lines and general cleanup.

The pen draws wherever you click or drag on the image. If you click with the left mouse button, the program uses the Left color specified in the Colors section. If you click with the right mouse button, the program uses Right color.

Pen Size. The Pen-Size option allows you to specify the size of the area that will be drawn to. As you move your mouse over the area, the pen size will be shown as a dotted box. If you click a mouse button, only the area within the box will be colored. If you make any mistakes while drawing, you can click the Undo Button, to revert to the previous image.