NIR images show areas with high water content, and consequently low NIR reflectance, as dark, whereas dryer regions have high NIR reflectance and appear bright. Using image analysis techniques, such reflectance patterns can be translated into colour-coded maps describing relative water content of plant tissue.
 Berger, Bettina; Regt, Bas de; Tester, Mark (2012): High-Throughput Phenotyping of Plant Shoots. In: Jennifer Normanly (editor.): High-Throughput Phenotyping in Plants, vol. 918. Totowa, NJ: Humana Press, pages 9–20. http://link.springer.com/10.1007/978-1-61779-995-2_2