Merge Alpha Mask and RGB Image with Java

MergeAlpha.java

package com.QYun.Test;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;

public class MergeAlpha {
    public static void main(String[] args) {
        try {
            var image = ImageIO.read(new File("src/main/resources/rgb.png"));
            var alpha = ImageIO.read(new File("src/main/resources/alpha.png"));
            var skadi = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB_PRE);

            for (int h = 0; h < image.getHeight(); h++) {
                for (int w = 0; w < image.getWidth(); w++) {
                    skadi.setRGB(w, h,
                            (((alpha.getRGB(w, h)) & 0xFF) << 24) |
                                    (image.getRGB(w, h) & 0xFFFFFF));
                }
            }
            ImageIO.write(skadi, "png", new File("skadi.png"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}