====== HDR Shop workflow ======

For fisheye lens, 3 shot to the ball is enough

  - Load images
    * define stop
    * define camera response curve : 2.2 or 1
  - generate the images
  - view + -
  - Select > Draw option > circle to define bound
  - Image > crop
  - Image > Exposure > scale to 0 to define mid point
  - Panoramic Transform
    * L-t
  - Save > radiance