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Step 9. DUPLICATE THE ADJUSTMENT LAYER, THEN INVERT THE MASK BY PRESSING COMMAND-I (PC: CONTROL-I)
Now, duplicate the Channel Mixer adjustment layer (the quickest way is to just press Command-J [PC: Control-J]). Press Command-I (PC: Control-I) to Invert the mask, so now the black part (the concealed part) is at the bottom, and the white area (the part of the area to be revealed) is on top. Of course, at this point, all it looks like is that we brought the really dark sky from two steps ago right back, but we're about to fix that.
Step 10. REOPEN THE CHANNEL MIXER AND RAISE THE CONSTANT BACK UP TO 0%
In the Layers palette, double-click directly on the Channel Mixer adjustment layer's thumbnail to bring up the Channel Mixer dialog with the settings you last input. The Constant slider will still be set at -60%, so all you have to do (to bring back the nice sky again) is raise that back up to 0% to get the effect you see here, which combines the nice sky with the good detail ground. We used two different masks: (1) to create the good ground and cover the sky, and (2) to hide the ground and reveal the good sky. If you see any green along the ground where the two masks meet (like you do here), press X to set your Foreground color to white and just paint it away.
Step 11. IF ANY COLOR AREAS SHOW, PAINT OVER THEM IN WHITE TO COMPLETE THE EFFECT (AS SHOWN HERE)
Here's the final image, with that green painted away by painting on the mask in white. It combines the good sky and the good ground, which together create one heck of a realistic infrared black-and-white effect.
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