Google Patents CN100585635C - Visualization method for Munsell colour model computer # done with the conversion # the manually converted data plot ( as (RGB (R_clip,G_clip,B_clip ), 'LUV' ), cex = 0.CN100585635C - Visualization method for Munsell colour model computer # define the transformation functions: # these are applied on a conditional basis:įun1 0.0031308, fun1 (mun_sRGB_D65 ), fun2 (mun_sRGB_D65 ) ) Setup environment and load lookup table data Colour space models for soil science Geoderma, 2006, 133, 320-337. Munsell color data can be downloaded here.įigure 4: Soil colors in multiple color spaces Example R code on the conversion is given below.
Figures 2 through 5 depict common soil colors in the RGB color space, visualized both in R and POVRAY. Figure 2 shows some of the common soil color chips in the same color space. Figure 1 shows all possible (both real and unreal) Munsell color chips in the L*U*V color space. The conversion of Munsell soil colors to RGB triplets, suitable for displaying on a computer screen or printing, is made complicated by the numerous operations involved in converting between color spaces. (2006) give a good background on various color space models and their relative usefulness in the realm of soil science. However, numerical analysis of colors encoded in the Munsell system is difficult because they are from a discrete set of color chips and referenced by values that include both letters and numbers.
The description of color via three variables tied to perceptible properties (hue, value, and chroma) under a standardized illuminant (sunlight on a clear day) makes the Munsell system a good choice for recording and interpreting soil color data. The Munsell color system was designed as a series of discrete color chips which closely approximation to the color sensitivity of the human eye.
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