Created
April 28, 2015 06:38
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colour rgb to nearest colour name
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| > nearColour <- function(r,g,b){ | |
| + ctable = col2rgb(colors()) | |
| + cdiff = ctable - c(r,g,b) | |
| + cdist = cdiff[1,]*cdiff[1,]+cdiff[2,]*cdiff[2,]+cdiff[3,]*cdiff[3,] | |
| + return(colors()[cdist == min(cdist)]) | |
| + } | |
| > rgb2 = col2rgb("#FEFDFC") | |
| > rgb2[[1,1]] | |
| [1] 254 | |
| > rgb2[[2,1]] | |
| [1] 253 | |
| > rgb2[[3,1]] | |
| [1] 252 | |
| > nearColour(254,253,252) | |
| [1] "gray99" "grey99" | |
| > nearColour(255,255,255) | |
| [1] "white" "gray100" "grey100" | |
| > nearColour(0,0,0) | |
| [1] "black" "gray0" "grey0" |
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from http://grokbase.com/t/r/r-help/09adb1pfpm/r-general-means-of-matching-a-color-specification-to-an-official-r-color-name