Rectangle
  1. Click an arbitrary position on the image.
    A rotatable rectangular window centered on that position will appear.
  2. Move the control points of the window on the image to adjust the position and size of the rectangular mask.
    Click [UNDO] to cancel the previous operation.
  3. Click [DRAW].
    The rectangular mask is drawn and filled in.
    If you click [ERASE], the mask is erased in the configured rectangular shape.
  4. Click [OK]. The rectangle setup is complete.
    Clicking [CANCEL] will cancel the setup.