# Pow ROI Zooming

To look more closely at a section of a graph, you need to pick a region of interest (ROI) for that graph. The current region of interest is shown by a blue box in the scope window. If there is no blue box, the ROI is an area large enough to display all of the elements (curves and images) of the selected graph and coincides with the enclosing black box in the scope.

There are four ways to change your region of interest:

Right click (Command-click on MacOS) and drag in the scope to create a new ROI.

Left clicking and dragging in the scope will "drag" the current ROI box. The main graph will be replotted using the new ROI when you release the left mouse button.

Use the Zoom option buttons (see Zoom).

Right click (Command-click on MacOS) and drag in the main POW window.

If the ROI does not overlap the current graph (ie, you are dragging out an ROI on an unselected graph), the ROI selection will be applied to the top graph overlapping the ROI. If the ROI does not overlap any graph, the ROI will be applied to the current graph.

Right double click (Command-double click on MacOS) in the main POW window or scope window. This will replot the graph and undo any previous zooming.

Zoom Option

Allow user to zoom in/out on the image/plot.

Zoom in (2x): Zoom in on the current perspective of the image by factor of 2.

Zoom out (2x): Zoom out on the current perspective of the image by factor of 2.

Zoom in 1x (2x, 4x, 8x, 16x, 32x): Zoom in on the original image size by factor of 1 (2, 4, 8, 16 or 32).

Invert X Axis: Flip the image on its X axis.

Invert Y Axis: Flip the image on its Y axis.

Invert Both: Flip the image on its X and Y axis.

Undo Invert: Un-flip the image.