Determine contrasting color based on another

ColorsHelper.java

import android.graphics.Color;

public final class ColorsHelper {
    /**
     * Contrast constant as defined by W3C for the sRGB color space where white and black are used
     * as the light and dark colors.
     * <p>
     * For more info, see https://www.w3.org/TR/WCAG20/#contrast-ratiodef
     * </p>
     */
    private static final double SRGB_CONTRAST_CONSTANT = 0.179;

    private ColorsHelper() {
    }

    /**
     * Calculates the contrasting color for a given color in the sRGB color space
     * <p>
     * For more info, see: {@link ColorsHelper#calculateRelativeLuminance(int)}
     * </p>
     *
     * @param color color to contrast against
     * @return {@link Color#WHITE} if the color is dark or {@link Color#BLACK} if the color is light
     */
    public static int calculateContrastingColor(int color) {
        return calculateRelativeLuminance(color) > SRGB_CONTRAST_CONSTANT ? Color.BLACK : Color.WHITE;
    }

    /**
     * Calculates the relative luminance for a given color in the sRGB color space.
     * <p>
     * For more info, see:
     * </p>
     * <p>
     * https://en.wikipedia.org/wiki/SRGB#The_reverse_transformation
     * <br />
     * https://www.w3.org/TR/WCAG20/#relativeluminancedef
     * </p>
     *
     * @param color
     * @return A value between 0 and 1. A value closer to 0 indicates a dark color, while closer to 1 indicates a light color
     */
    public static double calculateRelativeLuminance(int color) {
        //We use the median gamma value of 2.2
        double redLuminance = Math.pow(Color.red(color) / 255.0, 2.2);
        double greenLuminance = Math.pow(Color.green(color) / 255.0, 2.2);
        double blueLuminance = Math.pow(Color.blue(color) / 255.0, 2.2);

        return (0.2126 * redLuminance + 0.7152 * greenLuminance + 0.0722 * blueLuminance);
    }
}