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Find opposite color with max contrast

Source: R/plotly_Utils.R
opposite_color.Rd

[Stable] Finds an opposite color with maximum contrast to the input color.

Usage

opposite_color(
  col,
  method = c("complement", "complement_maxcontrast", "bw_maxcontrast"),
  degrees = 180
)

Arguments

col

A color name or hex string (e.g. "red", "#FF0000", "#FF0000FF").

method

The method to use for finding the opposite color. One of "complement", "complement_maxcontrast", or "bw_maxcontrast". Default is "complement".

degrees

The degree offset for the hue complement. Default is 180.

Value

A hex color string in the format "#RRGGBBAA".

Details

This function takes a color input (name or hex) and returns an opposite color using one of three methods:

  • "complement": strict 180 degrees hue complement

  • "complement_maxcontrast": 180 degrees hue complement adjusted for maximum contrast

  • "bw_maxcontrast": black or white, whichever has higher contrast The function uses the WCAG relative luminance and contrast ratio formulas to determine contrast.