One of the characteristics of infrared photos is that bright skies become velvet black. This particular image does not have sky, so no work is to be done. However, if you are working on an image of your own that has a bright sky, select the sky area with the Magic Wand tool (W) and feather it a small amount so that it blends in with the surrounding areas. Set the Foreground color to near black (R: 35, G: 35, and B: 35) and the Background color to medium gray (R: 150, G: 150, and B: 150). Select the Gradient tool and use it to paint the gradient in a natural way according to how the sky looks.
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