Add hue to Bitmap by hue value - Android Graphics

Android examples for Graphics:Bitmap Color

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Description

Add hue to Bitmap by hue value

Demo Code

/**/*from  w  w w .  ja v  a 2 s  .  c  om*/
 * Copyright 2014 Zhenguo Jin
 *
 * 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.java2s;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;

import android.graphics.Canvas;

import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;

import android.graphics.Paint;

public class Main {

    public static Bitmap hue(Bitmap bitmap, int hueValue) {
        // 
        float newHueValue = (hueValue - 127) * 1.0F / 127 * 180;
        // 
        ColorMatrix hueColorMatrix = new ColorMatrix();
        // 
        hueColorMatrix.setRotate(0, newHueValue);
        // 
        hueColorMatrix.setRotate(1, newHueValue);
        // 
        hueColorMatrix.setRotate(2, newHueValue);
        // 
        Paint paint = new Paint();
        paint.setColorFilter(new ColorMatrixColorFilter(hueColorMatrix));
        // 
        Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(),
                bitmap.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(newBitmap);
        // 
        canvas.drawBitmap(bitmap, 0, 0, paint);
        return newBitmap;
    }
}

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