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Nothing creates a mood like a cool-looking sky. But usually the best sky is a vastly different exposure than the ground beneath. I've tried combining photos before, but never really perfected the technique. This past Fall I wanted to show my Digital Darkroom class how to make one exposure from two in order to improve the overall tonal range of a photograph.
The above image is a combination of the three below. I used the brightest image as my primary photo. I layered the darkest image over the top and created a mask to only allow the sky to shine through. I then blended the middle photo to create the rich colors. After I had my exposure I created a Levels Adjustment Layer to correct the color cast (basically a white balance adjustment). I also used a Curves Adjustment Layer masked in certain areas to open up a few of the mid-tones. There was no need to increase the saturation or use Selective Color to pump up the reds and yellows since I already had a rich tonal range after combining the photographs. You could accomplish this same technique by shooting RAW and then processing the image twice: one overexposed and one underexposed.
The image was taken at Pinnacle Mountain State Park.