Find the Nearest Named R-Color to a Given RGB-Color
Converting a RGB-color to a named R-Color means looking for a color in the R-palette, which is nearest to the given RGB-color.
This function uses the minimum of squared distance ("euclidean") or the minimum absolute distance ("manhattan") as proximity measure. RgbToLong() converts a RGB-color to a long integer in numeric format. LongToRGB() does it the other way round.
RgbToCol(col, method = "rgb", metric = "euclidean") RgbToLong(col) LongToRgb(col)
col |
the color in rgb code, say a matrix with the red, green and blue code in the rows. |
method |
character string specifying the color space to be used. Can be |
metric |
character string specifying the metric to be used for calculating distances between the colors.
Available options are |
It may not be clear from the start which method, rgb or hsv, yield the more natural results. Trying and comparing is a recommended strategy. Moreover the shortest numerical distance will not always be the best choice, when comparing the colours visually.
the name of the nearest found R color.
Andri Signorell <andri@signorell.net>
ColToRgb and the other conversion functions
RgbToCol(matrix(c(162,42,42), nrow=3)) RgbToLong(matrix(c(162,42,42), nrow=3))
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