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If
possible, choose a landscape photographed in nice weather, with
a uniformly blue sky, clouds, and green foliage. The effect will
be strongest in such photos.
 On
the Layers palette, click Adjustment Layer (a black-and-white
circle) to choose Selective Color mode. At the bottom of
the appearing window, set Method to Absolute, and
change the above color channels according to the following values:
Reds channel: Cyan: -100, Magenta: -100, Yellow: 0
Yellows channel: Cyan: 0, Magenta: -100, Yellow: 0
Greens channel: Cyan: 0, Magenta: -100, Yellow: 0
Cyans channel: Cyan: -100, Magenta: +100, Yellow: -100
Blues channel: Cyan: -100, Magenta: +100, Yellow: -100
You
don't need to change the values for other channels.
 Similarly
make a new Adjustment Layer, this time selecting Channel
Mixer.
In the Channel Mixer window select Monochrome at the bottom,
and set the color channels to the following values: Red -50,
Green +200, Blue -50.
 Now
you have 3 different layers. Background contains the original
image, and you have created a Selective Color and a Channel
Mixer adjustment layer. Select the Selective Color layer,
and in the upper right corner of the palette, set the final tone
ratios for the picture by dragging the Opacity slider. In
this case we have set it to 60% but of course you should
always use a value fitting the particular image and your style.
As with real infrared effects, make the green foliage whitish but
not burnt out, and the blue dark, with bright clouds.
After completing the procedure, merge the layers by clicking Layer/Flatten
Image.
If you'd like an infrared image with a less digital feel, you can
add a "glowing grains" effect by clicking Filter/Distort/Diffuse
Glow.
Warning: As the particular color channels of digital cameras contain
only partial information relative to the whole image, the above
mixing and shifting of the channels may lead to a severe loss of
details and sharpness, as well as to the appearance of color noise.
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