Testing Color-Mixing Laws In Soil Mineral Mixtures
Usually mineral components have been previously considered as colorants, and consequently only subtractive laws have been applied to soil coloration systems. In this work we have tested the use of the Grassmann (additive mixtures) and Kubelka-Munk (subtractive mixtures) theories, in order to analyze the coloration in soil mineral blending systems.
We used 12 soil mineral mixtures making four separates of each with different mineralogical composition. The color of the mixtures and separates was independently measured using a PR-704 spectroradiometer and a D65 luminous source.
We computed the relative difference between the measured values in the mixtures and those estimated from the mineral separates using mixing laws, for CIELAB coordinates L*,Cab*,hab, and K/S parameter. On the average, these relative differences were 0.07 in L*, 0.23 in Cab*, and 0.03 degrees in hab using additive law, and 0.19 in K/S using subtractive law. These results suggest that the soil coloration systems studied here could also be appropriately described as additive mixing, in particular for soil samples having low Fe-oxides content.
Document Type: Research Article
Publication date: January 1, 2002
Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.
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