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我想制作截图，然后再滚动并再次制作截图，然后将这两个图像合并为一个，但忽略相同的元素。如何合并两个图像但忽略相同的元素？
我知道如何在java中合并两个图像，但不知道如何忽略相等部分。
public static BufferedImage joinBufferedImage(BufferedImage img1,BufferedImage img2) {
//do some calculate first
int offset = 5;
int wid = img1.getWidth()+img2.getWidth()+offset;
int height = Math.max(img1.getHeight(),img2.getHeight())+offset;
//create a new buffer and draw two image into the new image
BufferedImage newImage = new BufferedImage(wid,height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = newImage.createGraphics();
Color oldColor = g2.getColor();
//fill background
g2.setPaint(Color.WHITE);
g2.fillRect(0, 0, wid, height);
//draw image
g2.setColor(oldColor);
g2.drawImage(img1, null, 0, 0);
g2.drawImage(img2, null, img1.getWidth()+offset, 0);
g2.dispose();
return newImage;
}