Adjust the saturation and brightness of a color — adjust

Adjusts the saturation and brightness of RGB colors.

Usage

adjust_color(
  rgb_color,
  which_colors = "all",
  saturation = 1,
  brightness = 1,
  plotting = FALSE
)

Arguments

rgb_color: Matrix of RGB colors (0-1 scale).
which_colors: The indices of the colors to change. Can be a numeric vector or "all" to adjust all colors.
saturation: Factor by which to multiply saturation. > 1 = more saturated, < 1 = less saturated.
brightness: Factor by which to multiply brightness.
plotting: Logical. Plot resulting color palettes?

Value

A matrix of adjusted RGB colors.

Examples

# generate a palette:
p <- grDevices::palette.colors()

# convert to RGB using col2rgb, then divide by 255 to get it into a
# 0-1 range:
p <- t(col2rgb(p)/ 255 )

# we can adjust the saturation and brightness by the same factor:
p_1 <- adjust_color(p, saturation = 2,
                    brightness = 1.5,
                    plotting = TRUE)


# or we can pass a vector for the factors:
p_2 <- adjust_color(p,
                    saturation = seq(0, 2, length.out = 9),
                    plotting = TRUE)


# or we can target a single color:
p_3 <- adjust_color(p, which_colors = 4,
                    saturation = 2, brightness = 2,
                    plotting = TRUE)