While on a cross-country flight, I observed what looked like a complete circular rainbow, visible against the backdrop of clouds. I took several photos thru the window with my small Nikon camera, one of which is shown below:
We were at about 35,000 feet with a complete cloud deck below us. I looked down and saw this rainbow-like structure above the clouds. It remained in view for about 10 minutes, and it went away when the cloud deck began to rise with respect to our flight path.
While in flight my eyes had no trouble discerning the shape and colors Red, Orange, Yellow, Green, and Blue, but no Indigo or Violet. However, when I uploaded the photos to my desktop I could barely make out these colors.
I've been trying to use Mathematica to bring out the rainbow in the images, but without much success. I'm asking for ideas on how to enhance the colors and structure of the rainbow. As you will note in the photo, there appears to be further structure outside the main rainbow, so it would be interesting to manipulate multiple parameters in the photo.