Color interpolation

Color interpolation

colorRamp2(breaks, colors, transparency = 0, space = "LAB")

Arguments

breaks	A vector indicating numeric breaks
colors	A vector of colors which correspond to values in breaks
transparency	A single value in [0, 1]. 0 refers to no transparency and 1 refers to full transparency
space	color space in which colors are interpolated. Value should be one of "RGB", "HSV", "HLS", "LAB", "XYZ", "sRGB", "LUV", see color-class for detail.

Details

Colors are linearly interpolated according to break values and corresponding colors through CIE Lab color space (LAB) by default. Values exceeding breaks will be assigned with corresponding maximum or minimum colors.

Value

It returns a function which accepts a vector of numeric values and returns interpolated colors.

See also

col2value converts back to the original values by providing the color mapping function generated by colorRamp2.

Examples

col_fun = colorRamp2(c(-1, 0, 1), c("green", "white", "red"))
col_fun(c(-2, -1, -0.5, 0, 0.5, 1, 2))
#> [1] "#00FF00FF" "#00FF00FF" "#B1FF9AFF" "#FFFFFFFF" "#FF9E81FF" "#FF0000FF"
#> [7] "#FF0000FF"