![]() Color conversion. Color code converter. Color codes chart. Color conversions. Color code converter. HEX value is 6 digits (rrggbb). RGB values are in range of 0.255. The data set used to plot these colors is the Munsell Renotation Data, from the Munsell Color Science Laboratory at the Rochester Institute of Technology. Mouse coordinates are computed using code cribbed from quirksmode.js. Can someone tell me where to insert the RGB values to change the color of text? ![]() The Munsell color system was designed as a series of discrete color chips which closely approximation to the color sensitivity of the human eye. 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. 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. (2006) give a good background on various color space models and their relative usefulness in the realm of soil science. 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. Figure 1 shows all possible (both real and unreal) Munsell color chips in the L*U*V color space. Munsell Color SpaceFigure 2 shows some of the common soil color chips in the same color space. Figures 2 through 5 depict common soil colors in the RGB color space, visualized both in R and POVRAY. Example R code on the conversion is given below. Munsell color data can be downloaded. Color conversion equations. Figure 1: Munsell color chips. Figure 2: Common soil colors. Figure 3: Commom soil colors in RGB Figure 4: Soil colors in multiple color spaces Figure 5: Soil profile colors. References: • Rossel, R.A.V.; Minasny, B.; Roudier, P. Munsell To Pantone Conversion& McBratney, A.B. Colour space models for soil science Geoderma, 2006, 133, 320-337. Manual Conversion in R Setup environment and load lookup table data. ## x and y are approx (0,1) ## Y is approx (0,100) ## need manually rescale Y to (0,1) all$Y. ## conversion matrix, from reference above ## this has been revised as of Jan, 2008 M_adapt_C_to_D65 D65 using Bradford method mun_XYZ_D65.
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