This is not doctored, there was a rainbow after last nights rain and as a good photographer I do follow rainbows to get the shot. There could have been more sun light but you can see the sevenfold red, orange, yellow green blue indigo and violet just above our new space.
The rainbow's appearance is caused by dispersion of sunlight as it goes through raindrops. The light is first refracted as it enters the surface of the raindrop, reflected off the back of the drop, and again refracted as it leaves the drop. The overall effect is that the incoming light is reflected back over a wide range of angles, with the most intense light at an angle of 40°–42°. The angle is independent of the size of the drop, but does depend on its refractive index.
So keep looking up after the rain best at the end of the day.
