Calculates the brightness of a color, based on its RGB values. - Android Graphics

Android examples for Graphics:Color RGB Value

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Description

Calculates the brightness of a color, based on its RGB values.

Demo Code

/*// w  w w . j  a v  a  2 s .c  o  m
 * Copyright 2013 Phil Brown

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
//package com.book2s;

import android.graphics.Color;

public class Main {
    /**
     * Calculates the <em>brightness</em> of a color, based on its RGB values.
     * @param color the color whose brightness is in question
     * @return a brightness value in the range [0-255].
     * @see <a href="http://www.nbdtech.com/Blog/archive/2008/04/27/Calculating-the-Perceived-Brightness-of-a-Color.aspx">Calculating the Perceived Brightness of a Color</a>
     */
    public static int colorBrightness(int color) {
        int r2 = Color.red(color) * Color.red(color);
        int g2 = Color.green(color) * Color.green(color);
        int b2 = Color.blue(color) * Color.blue(color);

        return (int) Math.sqrt(r2 * 0.241f + g2 * 0.691f + b2 * 0.068f);
    }
}

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