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Testing Color-Mixing Laws In Soil Mineral Mixtures

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Traditionally the mixing of colored lights as that produced in a visual colorimeter and the mixing of colorants used in paint mixtures have been considered additive and subtractive coloration systems, respectively. Although mixing laws have been developed for each case (the so-called Grassmann and Kubelka-Munk laws), many systems can not be accurately described, or use both additive and subtractive mixing.

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.
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Document Type: Research Article

Publication date: January 1, 2002

More about this publication?
  • 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.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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