Robust application of such tools, however, requires standardized light sources, which precludes the use of digital cameras as viable devices for use in the field.
Low-cost digital devices (cameras and scanners) could largely replace the semi-quantitative assessment of colour by Munsell charts if such devices can be calibrated colorimetrically to provide accurate and reproducible data. Quantitative data from spectrophotometers and colorimeters have been used in soil research for this purpose, but semi-quantitative Munsell colour description remains the main method of soil colour evaluation. Colour is an important physical property in the characterization of soil type and the description of soil profiles.
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