Lisa Bettany, a professional photographer based in San Fransisco, wrote an interesting article about how she shot and processed a stunning rainbow photo. Even though the picture she got right out of the camera looked great, she was able to use Lightroom and Photoshop to make it really pop. Here’s what she did:
After she spotted the rainbow, she took her camera, found the right settings and started taking pictures over a period of time to try to catch the best moment. Then, after importing the pictures into Lightroom, she picked the best, tweaked the RAW image a bit, before she sent it to Photoshop for some polishing work. Lastly, back to Lightroom for some finishing touches.
Here are the before-and-after pictures:
BEFORE: San Fransisco Bay Bridge Rainbow – RAW from camera 
AFTER: Processed using Lightroom & Photoshop