Java - create negative image

package com.example;

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import java.awt.Color;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

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import javax.imageio.ImageIO;

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public class Program {

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    public static void main(String[] args) throws IOException {

        BufferedImage aImage = ImageIO.read(new File("a.png"));  // A image (input image)

        int aWidth = aImage.getWidth();

        int aHeight = aImage.getHeight();

        BufferedImage bImage = new BufferedImage(aWidth, aHeight, BufferedImage.TYPE_INT_RGB);

        for (int y = 0; y < aHeight; ++y) {

            for (int x = 0; x < aWidth; ++x) {

                Color aColor = new Color(aImage.getRGB(x, y));

                Color bColor = new Color(255 - aColor.getRed(), 255 - aColor.getGreen(), 255 - aColor.getBlue());

                bImage.setRGB(x, y, bColor.getRGB());

            }

        }

        ImageIO.write(bImage, "PNG", new File("b.png"));  // B image (output image)

    }

}