The photograph is not from Mars, but it looks like something the Curiosity Rover could have taken. Sorry for the false advertising. By the way, NASA says the Martian sky is a butterscotch color.
The image was taken as part of a "negative space" macro challenge. I wanted an unusual entry so I grabbed the IR camera.
|Violin Bridge on a laptop screen.. Click for larger view.|
Lighting was from two overhead halogen lamps. The initial post-processing was as described in my Before and After post except I did not use the NIK filters to darken the image. There was no channel swap.
This image features the interesting tone-on-tone effect that is difficult to reproduce with other cameras.