They are taken on a camera that has been adapted for Infrared. The magenta RAW image that comes out of the camera can be adjusted in Photoshop by swapping blue and red channels but I do my adjustment in Lightroom by using the Camera Calibration box. I have built a Profile for my IR Camera using the DNG Profile Editor. This camera Standard can be applied to all the IR Raws. The temperature can then be adjusted to get the preferred colour range or converted to monochrome.
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