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.
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.
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.
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.
Source: Digiretus
http://www.digiretus.com
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