It's relatively easy to simulate an IR look by manipulating an existing digital file.
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I found a "recipe" online for simulating the look of infrared photography via my old version of Photoshop from someone who allegedly (sorry, I can't help from slipping into "lawyerspeak" now and then) nicked it in 2004 from Digital Photo magazine. I found it worked best on landscape photos, like the one above.
(1) Channel mixer: monochrome. Start all at zero, whack the Blue to -150%, then Red up to around 150%, tweak with some green. If lots of foliage, do the green first, and add some Red (say 30%). You've got to fiddle around to get the best results (but start with blue down first)
(2) To simulate the glow around the highlights that IR film gives:
* Click D to reset foreground/background colours to Black/White
* Filter / Distort / Diffuse Glow
* Graininess=0, Glow Amount=1, Clear Amount=9
(3) Then add realistic grain (on a separate layer:
* Call up layers palette
* New empty layer
* Edit / Fill - 50% gray
* Blend mode to Overlay
* Filter / Noise / Add Noise
Gaussian, Monochromatic. Between 10-20%
* Filter / Texture / Grain
Grain Type = Enlarged
Intensity = 0 (for B&W)
Adjust Contrast (around 30)
Here's the result of the first effort:
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However, I wasn't happy with the sky, so I started again. Note the Photoshop receipes are like cooking recipes: you have to experiment to find out what you like best...
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Note that this version also has less severe shadows in the bush and rocks at the foreground. Here's the revised recipe:
(1) Channel mixer: monochrome. Start all at zero, reset Blue to -150%, reset Red to 100%, green=8.
(2) * Click D to reset foreground/background colours to Black/White
* Filter / Distort / Diffuse Glow
* Graininess=0, Glow Amount=1, Clear Amount=13
(3) Then add realistic grain (on a separate layer:
* Call up layers palette
* New empty layer
* Edit / Fill - 50% gray
* Blend mode to Overlay
* Filter / Noise / Add Noise
Gaussian, Monochromatic. Between 10-20%
* Filter / Texture / Grain
Grain Type = Clumped
Intensity = 0 (for B&W)
Adjust Contrast (around 30)
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