The default control window
The control window can be opened either by selecting Control from the iconbar icon menu, or by clicking Select on the iconbar icon.
The default control window shows 4 buttons
that can be used to select the mode in which the program will work.
Screen
In this mode the entire screen area will be captured each time.Window
In this mode the window under the mouse pointer will be captured. This includes the window title bar and scroll bars. This was the mode used to capture the screen shot of the control window, above.Contents

Area
In this mode, a box will
appear marking an area of the screen. The area inside
the box will be saved. The area can be moved or resized by dragging on
the sides or corners.
Drag on a corner. Dragging on any of the corners will resize the rectangular area by moving that corner. If the control key is held down while dragging any of the corners, the area will expand or contract symmetrically about the centre point. If the shift key is held down, then dragging any corner will move the whole area rather than change its size.
Drag on a side. Dragging the side of the area will move the area around the screen. If the shift key is held down while dragging, the area will be resized by moving only that side. If the ctrl key is held down then the area will expand or contract symmetrically by moving the opposite sides. If one of the sides would go offscreen, it is clamped to the screen edge. In addition, double clicking on any side of the area will open the coordinate display window (more details here).
When the area is moved or resized, the snap area will be constrained to the screen boundaries, although to fully include the screen edge, the corresponding border will be just out of view off screen. Note also that the area follows the normal wimp convention for dragging, i.e. dragging with SELECT will bring the area to the top of the window stack, dragging with ADJUST will retain its original position in the window stack.
The size of the area to grab (in pixel) is shown in the top bar of the bounding box. The values update in real time as the box is resized.
If you need even more precise control over the position and size of the snap area, then you can use the coordinate display window (more details here).
Snap button
Finally the 'Snap' button triggers the screen capture. The save can either be- via a standard save box
- directly to a preconfigured directory
- to the global clipboard
- immediately filer_run
More details on saving are given here.
Obviously the Snap button is not always of use. For the Window and Contents modes, you would always end up with a picture of the Snapper control window. To get around this, it is also possible to trigger screen capture with a key press. By default this keypress is to hold down the left hand Ctrl and Alt keys.