Mouse

Top

In Zoom mode


Left Click   
Increases the apparent size of objects in the viewport (Zoom-In).


Right Click   
Decreases the apparent size of objects in the viewport (Zoom-Out)

Select Window

Stretches the chosen area up to the sizes of a Display Window.Click and move mouse to select the rectangle.

In Scroll mode   
Navigate the image with a left click and mouse movement.


In Select mode   
Navigate the image with a left click and mouse movement.
Click and move mouse to select the rectangle.
SHIFT key allows to select multiple regions. Pressing ALT the selection maintains aspect ratio.