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The physics behind the sometimes strange effects and ‘unnatural ’ appearance of near-infrared (NIR) photographs is discussed in terms of reflection, absorption and transmission of NIR radiation with the respective objects. Besides discussing how NIR cameras work, several visible and NIR photograph pairs are presented, which include vegetation, natural water, clouds, the sky, and humans. In addition, some physics-oriented experimental NIR images are presented which clearly demonstrate some of the basic physics behind some of these awesome sights. (Some figures may appear in colour only in the online journal) 1.
Mangold et al. (Tue,) studied this question.
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