### Edit Mask

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If you have selected a frame which contains image data, this menu item is selectable. When you select it, a control pane is shown below the selected frame.

The control pane shows various elements which can be used to edit the mask and image itself:

Image

  When you select this left control segment, the image data object will be selected for editing.

Mask

  When you select this right control segment, the mask object will be selected for editing.

Slider

  Moving the slider adjusts the scale of the image.

Done

  Click this button to exit the Edit Mask mode. The control pane will be removed from screen. Alternatively, [Escape] also closes the control pane.