Image Comparison in Selenium Using aShot third party jar

Add   ashot Dependency 


    ru.yandex.qatools.ashot
    ashot
    1.5.3

Take a screenshort of ur image 

WebElement myWebElement = webDriver.findElement(By.cssSelector("#my_element"));
new AShot()

  .takeScreenshot(webDriver, myWebElement);


Compare with actual image using imagediff


ImageDiff diff = new ImageDiffer().makeDiff(myScreenshot, anotherScreenshot);

BufferedImage diffImage = diff.getMarkedImage();

	import java.awt.image.BufferedImage;
	import java.io.File;
	import javax.imageio.ImageIO;
	import org.openqa.selenium.By;
	import org.openqa.selenium.WebDriver;
	import org.openqa.selenium.WebElement;
	import org.openqa.selenium.chrome.ChromeDriver;
	import org.testng.Assert;
	import ru.yandex.qatools.ashot.AShot;
	import ru.yandex.qatools.ashot.Screenshot;
	import ru.yandex.qatools.ashot.comparison.ImageDiff;
	import ru.yandex.qatools.ashot.comparison.ImageDiffer;
	import ru.yandex.qatools.ashot.coordinates.WebDriverCoordsProvider;
	public class Image_Comparsion
	{
	public static void main(String args[]) throws Exception
	{
	System.setProperty("webdriver.chrome.driver","D://Chrome Driver 2.38//chromedriver_win32//chromedriver.exe");
	WebDriver driver = new ChromeDriver();
	driver.get("http://www.google.com");
	WebElement logoImage = driver.findElement(By.xpath("//img[@id='hplogo']"));
	BufferedImage expectedImage = ImageIO.read(new File(System.getProperty("user.dir") +"\\Images\\googleLogo.png"));
	Screenshot logoImageScreenshot = new AShot().coordsProvider(new WebDriverCoordsProvider()).takeScreenshot(driver, logoImage);
	BufferedImage actualImage = logoImageScreenshot.getImage();
	ImageDiffer imgDiff = new ImageDiffer();
	ImageDiff diff = imgDiff.makeDiff(actualImage, expectedImage);
	Assert.assertFalse(diff.hasDiff(),"Result of Image comparsion");
	System.out.println("Images Compared Sucesfully");
	}
	} https://www.qaautomation.co.in/2018/11/image-Comparison-in-selenium-using-ashot.html