col2value | R Documentation |
Transform back from colors to values
col2value(r, g, b, col_fun)
r |
red channel in |
g |
green channel in |
b |
blue channel in |
col_fun |
the color mapping function generated by |
colorRamp2
transforms values to colors and this function does the reversed job.
Note for some color spaces, it cannot transform back to the original value perfectly.
A vector of original numeric values.
Zuguang Gu <z.gu@dkfz.de>
x = seq(0, 1, length.out = 11)
col_fun = colorRamp2(c(0, 0.5, 1), c("blue", "white", "red"))
col = col_fun(x)
col2value(col, col_fun = col_fun)
col2value("red", col_fun = col_fun)
col_fun = colorRamp2(c(0, 0.5, 1), c("blue", "white", "red"), space = "sRGB")
col = col_fun(x)
col2value(col, col_fun = col_fun)
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