Picture Comparison Code Not Working Properly

I am still very much a beginner in programming and am facing a problem with a Java code. I would be very thankful for suggestions and comments. The problem is as following:

I found a Java code online that is designed to compare two pictures and highlight the differences between them. However, the way the code works is by using a loop that compares the RGB value of each pixel of the two pictures and highlights it in a certain color if the value is equal. This however results in a problem that even the slightest shift in camera angle or lighting conditions between the two pictures leads to a different RGB value of the pixels making the code highlight them as a difference even though the pictures are mostly identical. The code is written below and i have added the link to photos showing examples of the outcome of the code. What would you suggest i change in the code? Thank you for your help in advance.

The code:

Code:

---

import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
     
    import javax.imageio.ImageIO;
public class PictureOverlayTest {
    /*
    * Four variables, three for the wanted BufferedImages, one String for the
    * Path of the third Image, which does not already exist.
    */
 
    private BufferedImage image1;
    private BufferedImage image2;
    private BufferedImage image3;
 
    private String pathImage3;
 
    public PictureOverlayTest(String filePathAndName1, String filePathAndName2,
            String filePathAndName3) throws IOException {
        /*
        * Constructor in order to keep this method reusable and clean. Needs
        * three Strings. The paths and Filenames of all three images. Image 1
        * and 2 should exist already, Image 3 will be created if all
        * requirements are met. Constructor creates the first two buffered
        * images, sets all needed variables and starts the checkAndCompare()
        * method
        */
 
        File file = new File(filePathAndName1);
        this.image1 = ImageIO.read(file);
 
        file = new File(filePathAndName2);
        this.image2 = ImageIO.read(file);
 
        this.pathImage3 = filePathAndName3;
        checkAndCompare();
    }
 
    private void checkAndCompare() throws IOException {
        /*
        * This function creates the Color blue, compares the sizes of both
        * pictures and if they are the same, creates a third image. Then it
        * loops through the two images and compares each pixel. If the pixels
        * are the same, the third image gets a blue pixel at that point
        */
 
        Color blue = Color.blue;
        Color yellow = Color.yellow;
 
        if (image1.getHeight() == image2.getHeight()
                && image1.getWidth() == image2.getWidth()) {
 
            image3 = new BufferedImage(image1.getWidth(), image1.getHeight(),
                    image1.getType());
            for (int y = 0; y < image1.getHeight(); y++) {
                for (int x = 0; x < image1.getWidth(); x++) {
 
                    int colorImage1 = image1.getRGB(x, y);
                    int colorImage2 = image2.getRGB(x, y);
 
                    if (colorImage1 == colorImage2) {
 
                        image3.setRGB(x, y, blue.getRGB());
 
                    } else {
                              image3.setRGB(x, y, yellow.getRGB());
                        // Whatever Color you want. By default it is black.
 
                    }
 
                }
            }
            savePicture3();
            System.out.println("Message: Image comparison is done");
 
        } else {
 
            System.out.println("Error: Image dimensions do not match");
 
        }
 
    }
 
    private void savePicture3() throws IOException {
        /*
        * This method saves the created Image into a file onto your computer.
        * The if() statement is used to check if the file was successfully
        * created, in order to avoid unwanted errors. Keep in mind, that you
        * have to change the "bmp" in ImageIO.write() to whatever format you
        * actually want
        */
 
        File file = new File(pathImage3);
        if (file.createNewFile()) {
            ImageIO.write(image3, "bmp", file);
        }
    }
 
}
 
import java.io.IOException;
 
public class Main {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
 
        try {
            PictureOverlayTest test = new PictureOverlayTest(
                    "C:\\Users\\Rabee Taha\\Desktop\\Java Test Pics\\test1.png",
                    "C:\\Users\\Rabee Taha\\Desktop\\Java Test Pics\\test2.png",
                    "C:\\Users\\Rabee Taha\\Desktop\\Java Test Pics\\test3.png");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
 
}

---

Here is the link to example images of the outcome ( https://postimg.cc/gallery/rkXfPr7 )

Also posted here: https://coderanch.com/t/744374/java/...rking-Properly

Note: Posted code is missing an import statement and will not compile.