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Convert RGB Values to HEX Color Codes

Source: R/color.R
rgb2hex.Rd

Convert RGB or RGBA values to HEX color codes. Accepts either a numeric vector or a data.frame, symmetrically with hex2rgb().

Usage

rgb2hex(rgb)

Arguments

rgb

A numeric vector of length 3 (r, g, b) or 4 (r, g, b, alpha), or a data.frame with r, g, b, and optional alpha columns. Matrices and arrays are not accepted. Values must lie in [0, 255] and are rounded to the nearest integer, with exact halves rounded up. In a data.frame, alpha = NA emits 6-digit HEX; a finite alpha value emits 8-digit HEX. Data frames must contain at least one row; unrelated extra columns are ignored.

Value

A character vector of uppercase 6- or 8-digit HEX color codes.

Examples

rgb2hex(c(255, 128, 0))
#> [1] "#FF8000"
rgb2hex(c(255, 128, 0, 178))
#> [1] "#FF8000B2"
rgb2hex(hex2rgb(c("#FF8000", "#00FF0080")))
#> [1] "#FF8000"   "#00FF0080"