shAf:

Thanks one learns something new every day!

BTW it also works for vertical lines too. I my case, I take a lot of skiing
photos. Oftentimes the only reference to either horizontal or vertical are
the trees. (The person shooting quick action, sideslope, very rarely holds
the camera level I have found, especially when I am that person.) Draw a
"ruler" tool line to bring the trees to approx. vertical and you have
leveled the picture.

John

  >
  >     Not true ... I just pulled up an old image with a non-level horizon,
  > and with the "ruler" tool drew a line across the horizon.  Now
  > Image=>rotate_canvas=>arbitrary" indicates the exact rotation
  > necessary to make the horizon horizontal ... to a hundredth of a
  > degree!
  >
  > shAf  :o)
  >

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