I first switched to monochrome, and applied a some filters to clear up haze and sharpen the landscape to bring out the details of the rocks. I also applied an overall slightly red hue, since both colors I was aiming for would have significant red in them.
I then masked both the sky and landscape so I could adjust each separately. I adjusting some lighting paramaters (contrast, highlights, shadows, etc.) for each befor turning to color.
For this part, I separately adjusted the red, blue and green curves to get the shades I was looking for. This was a very interesting and educational exercise for me, as I know practically nothing about color theory! Overall the colors are intentionally very dramatic, perhaps in reaction to posting so many monochrome images the last couple of days. The colors are also much more saturated than colors on Mars are in real life; but also, I thought, more fun to produce.
For my try at this challenge, I had an idea similar to Rock's, and tried to imagine this scene on (an idealized) Mars. My goal was to get a butterscotch sky and a brick-red landscape. All processing done in Lightroom; see alt text for details.
#ECK #Photography #PostProcess #TonalShift