Greetings, After pouring over the documentation for the 'colorspace' package, I have not been able to figure out how the plot() method converts colorspace coordinates to RGB values for display on the screen. I am convert between colorspaces with the various as() methods... but cannot seem to find a way to extract RGB (i.e. for displaying on a computer screen) triplets from color space coordinates.
Here is a sample of the data that I am working with: H V C x y Y 2.5Y 0.2 2 1.43 0.97 0.237 2.5Y 0.4 2 0.729 0.588 0.467 2.5Y 0.6 2 0.563 0.491 0.699 2.5Y 0.6 4 0.995 0.734 0.699 2.5Y 0.8 2 0.479 0.439 0.943 2.5Y 0.8 4 0.82 0.64 0.943 2.5Y 1 2 0.4362 0.4177 1.21 I have converted xyY coordinates to XYZ coordinates, based on the equations presented here: http://www.brucelindbloom.com/index.html?ColorCalcHelp.html #read in the soil colors: munsell + xyY soil <- read.table("soil_colors", header=F, col.names=c("H","V","C","x","y","Y")) #convert to XYZ X <- (soil$x * soil$Y ) / soil$y Y <- soil$Y Z <- ( (1- soil$x - soil$y) * soil$Y ) / soil$y #make an XYZ colorspace object: require(colorspace) soil_XYZ <- XYZ(X,Y,Z) #visualize the new XYZ colorspace object in the L*U*V colorspace: plot(as(soil_XYZ, "LUV"), cex=2) here is an example of the output: http://169.237.35.250/~dylan/temp/soil_colors-LUV_space.png Somehow the plot() method in the colorspace package is converting color space coordinates to their RGB values... Does anyone have an idea as to how to access these RGB triplets? Thanks in advance! -- Dylan Beaudette Soils and Biogeochemistry Graduate Group University of California at Davis 530.754.7341 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html