Sometimes it will be helpful to zoom the shown images, for instance during VOI outlining. Image zooming can be operated in different ways
Scrollbar Zooming
Often images ports have a scrollbar area around them. Then the zoom buttons can be used for zooming/shrinking, or a zooming factor can directly be entered. resets zooming. If the scrollbar is not visible, it can be shown by the indicated button to the image right.
If there is no such button, the image context menu (click right mouse button in image area) can be used instead.
The visible part of the image can be adjusted using the scrollbars around the image which appear as soon as the full image is not visible any more.
Mouse-driven Zooming
There is also a mode for mouse-driving zooming which can be entered by the button from the image border or the context menu.
When the cursor is moved over the image, it changes its shape:
Note that the zoom/pan functions are only working in the active image indicated by the red corner brackets. However, it is easy to change the active image or the active plane in the orthogonal planes mode: just CTRL+Click onto the image that should get the focus and continue.
After appropriate zooming, the zoom mode should be quit by pressing once more, because some of other mouse-operated functions might not work.