In order to view an image just click on its thumbnail and the image will be visualized in the viewer pane. If the image doesn't fit the viewer pane you can give more space to the viewer hiding the browser, this can be accoplished pressing the Return key, pressing it again the browser will be re-displayed. Another way of viewing a big image is to view it in full screen mode, type v to activate/disactivate the full screen mode.
Mouse operations :
Left Button : Show next image.
Right Button : Pop up the image menu.
Holding down the left button and moving the mouse : move the image.
Another way of moving the image is the navigation button :
Some keyboard shortcuts :
f : Flip the image.
m : Mirror the image.
r : Rotate the image clockwise.
g : Stop/Start the current animation.
j : View the next frame of the current animation.