Editing Selected Areas- Part II
  page 8

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The mask is looking dark, but now shows the foreground Aspens in shades of gray with about everything else black. Let’s try it with a Gray / Brightness Curve transformation . . .

masking step 12

The preview window shows this has emphasized the trees and left the sky alone. You could also use this contrast mask with the Color / Saturation transformation for color enhancement, but the colors look pretty intense in this image already.