1/1/19

How to compare Images in Selenium with Java using Ashot API


In this article I'm going to explain how to capture the screen shot of specific elements (Especially images) and compare image with our expected image.

This is very important scenario when You are automating test cases. Unfortunately Selenium does not provide any Classes t achive this, But still we can do this using third party API AShot.


Below is code and explained in the video how to compare images using AShot API.



Pre-Requisites:

You have to download third party API jars. Links provided below.

ashot 1.5.3
https://mvnrepository.com/artifact/ru.yandex.qatools.ashot/ashot/1.5.4

Gson 2.8.5
https://mvnrepository.com/artifact/com.google.code.gson/gson/2.8.5

Hamcreast-all 1.3
https://mvnrepository.com/artifact/org.hamcrest/hamcrest-all/1.3

Capture logo image present on a web page.

import java.io.File;
import java.io.IOException;
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 ru.yandex.qatools.ashot.AShot;
import ru.yandex.qatools.ashot.Screenshot;

public class CaptureLogoImage
{
    public static void main(String args[]) throws IOException
    {
    System.setProperty("webdriver.chrome.driver","C://Drivers/chromedriver_win32/chromedriver.exe");
    WebDriver driver=new ChromeDriver();
       
        driver.get("https://opensource-demo.orangehrmlive.com/");
             WebElement logoImageElement = driver.findElement(By.xpath("//*[@id=\"divLogo\"]/img"));
             Screenshot logoImageScreenshot = new AShot().takeScreenshot(driver, logoImageElement);
       ImageIO.write(logoImageScreenshot.getImage(),"png",new File("C://SeleniumPractice/logos/OrangeHRMlogo.png"));
             File f = new File("C://SeleniumPractice/logos/OrangeHRMlogo.png");
if(f.exists())
{
   System.out.println("Image File Captured");
}
else
{
System.out.println("Image File NOT exist");
}
          }
}

Compare images

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
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 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;

public class ImageComparison
{
    public static void main(String args[]) throws IOException
    {
    System.setProperty("webdriver.chrome.driver","C://Drivers/chromedriver_win32/chromedriver.exe");
    WebDriver driver=new ChromeDriver();
       
        driver.get("https://opensource-demo.orangehrmlive.com/");
             
        BufferedImage expectedImage = ImageIO.read(new File("C://SeleniumPractice//logos/OrangeHRMlogo.png"));
             
        WebElement logoImageElement = driver.findElement(By.xpath("//*[@id=\"divLogo\"]/img"));
        Screenshot logoImageScreenshot = new AShot().takeScreenshot(driver, logoImageElement);
        BufferedImage actualImage = logoImageScreenshot.getImage();
               
        ImageDiffer imgDiff = new ImageDiffer();
        ImageDiff diff = imgDiff.makeDiff(actualImage, expectedImage);
        if(diff.hasDiff()==true)
        {
        System.out.println("Images are Not Same");
        }
        else {
        System.out.println("Images are Same");
        }
                     
      driver.quit();
    }
}


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