画象diff | Codetter（こーどったー）

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import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class ImageDiff {
    // 入力ファイル
    public static final String INPUT1 = "data/input1.jpg";
    public static final String INPUT2 = "data/input2.jpg";
    // 出力ファイル
    public static final String OUTPUT = "data/output.jpg";
    // 操作用画象
    private static BufferedImage image1;
    private static BufferedImage image2;
    private static BufferedImage output;
    public static void main(String[] args) {
        loadImage();
        doProcess();
        saveImage();
    }
    /**
     * 画象処理
     */
    private static void doProcess() {
        int width = Math.max(image1.getWidth(), image2.getWidth());
        int height = Math.max(image1.getHeight(), image2.getHeight());
        output = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                int rgb1;
                if ((x <= image1.getWidth()) && (y <=image1.getHeight())) {
                    rgb1 = image1.getRGB(x, y);
                } else {
                    rgb1 = 0;
                }
                int rgb2;
                if ((x <= image2.getWidth()) && (y <=image2.getHeight())) {
                    rgb2 = image2.getRGB(x, y);
                } else {
                    rgb2 = 0;
                }
                int diff = rgb1 - rgb2;
                output.setRGB(x, y, diff);
            }
        }
    }
    /**
     * 画像の読み込み
     */
    private static void loadImage() {
        try {
            image1 = ImageIO.read(new File(INPUT1));
            image2 = ImageIO.read(new File(INPUT2));
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
    /**
     * 画像書き込み
     */
    private static void saveImage() {
        try {
            ImageIO.write(output, "jpg", new File(OUTPUT));
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
}
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