1. Select rotation tool 
  2. Rotation tool will be started
  3. Rotate image with mouse, the grid color can be adjusted using 'G' key on keyboard
  4. The image quality during rotation is not high, it's restored when user exits rotation tool
  5. Use Rotation angle control for precise adjustment (with 0.1° step), press Shift to use 22.5° step
  6. Rotation angle can be copied to other images with contour


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