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