Manipulating a single image

To try the following functions, read in an image by selecting File from the menu bar.

Normal zooming: The image may be panned directly using the mouse in combination with the control key. While the control key is down, the buttons have the following effects:

• The middle button allows the image to be dragged around the display area.

• The left and right buttons zoom the image about the point where the button was pressed. The left button zooms in and right zooms out.

Smooth zooming: The image may also be zoomed ``smoothly''. To activate this press the ``z'' key. While the control key is down the mouse has the following effects:

• As before the middle mouse button allows the image to be dragged around the display.
• The right mouse button now has no effect.
• Clicking the left mouse button anywhere in the image and dragging it upwards zooms into the image. Dragging the mouse downwards zooms out from the image.