Calculates the contrast between the given color and white - Android Graphics

Android examples for Graphics:Color

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Description

Calculates the contrast between the given color and white

Demo Code


//package com.java2s;
import android.graphics.Color;

public class Main {
    /**//from w ww. j  av  a  2 s  .co m
     * Calculates the contrast between the given color and white, using the algorithm provided by
     * the WCAG v2 in http://www.w3.org/TR/WCAG20/#contrast-ratiodef.
     */
    private static float getContrastForColor(int color) {
        float bgR = Color.red(color) / 255f;
        float bgG = Color.green(color) / 255f;
        float bgB = Color.blue(color) / 255f;
        bgR = (bgR < 0.03928f) ? bgR / 12.92f : (float) Math.pow(
                (bgR + 0.055f) / 1.055f, 2.4f);
        bgG = (bgG < 0.03928f) ? bgG / 12.92f : (float) Math.pow(
                (bgG + 0.055f) / 1.055f, 2.4f);
        bgB = (bgB < 0.03928f) ? bgB / 12.92f : (float) Math.pow(
                (bgB + 0.055f) / 1.055f, 2.4f);
        float bgL = 0.2126f * bgR + 0.7152f * bgG + 0.0722f * bgB;
        return Math.abs((1.05f) / (bgL + 0.05f));
    }
}

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