How Do You Compare Two Images for Similarity


In every photo gallery, there are so many similar images that take up space. Sometimes these duplicate images are created by editing software, while others result from clicking multiple shots. To delete duplicate photos from a PC, you must know how to compare these images.

More importantly, knowing the criteria that can help you keep the best shot and remove the redundant ones can greatly help. So how to compare two images for similarity? Well, that is the central question we will answer in this post.

We will also be discussing ways you can make the comparison less time-consuming and more effective. Without further ado, let’s jump right into it!

Best Ways to Compare Two Images For Similarity

There are so many factors that make two images similar. And so many factors confuse whether two images are similar or not. For instance, two images at the exact location clicked in a similar frame may look similar; however, the subject in focus might differ.

The same goes for multiple shots taken at any event or a party where one picture focuses on something while the other shots are either blurry or have a different orientation. While choosing the best image, there are multiple criteria that you must keep in mind. Some of these criteria are –

  • Picture quality
  • Clarity of in-frame objects
  • Orientation and overall crispness
  • Timestamp at which the images were clicked
  • Location of the image and frame settings
  • Bitmap size of the image
  • Details in a picture.

These 7 criteria can help you distinguish between photos and show similarities between the two. Sure duplicate images are exact copies of the original, and similar pictures have something different. Still, if you do not go into the details of the similar images, they all appear to be the same.

If you want to compare two images for similarities, there are a few ways to use them. Check them out below!

1. Differentiate the images based on the time they were clicked

It is an excellent way of sorting your images. Use the sort feature in your file explorer, and you will have a segregated list of images based on the time they were clicked. To clear things up, here’s a quick example –

  • Go to the folder where your images are saved.
  • Right-click anywhere in the folder to find your view and sort the menu

image sort by name

  • Select Sort By and then mark the date modified
  • Depending on your choice, you can also choose the ascending or descending option.

Once you have sorted the images, go through each to realize which one was clicked first and which is more detailed. Classifying pictures based on time gives you an idea of which images were clicked in a burst and which ones are substantially different than the others.

Photos that were clicked in a matter of seconds and minutes seem to be more similar than what you would have captured later, and thus this technique can be of great help.

The only downside of this technique is that if you have modified the images after copying them on your PC, Windows often takes the last modified time as the file origin.

2. Go through images to Compare their Details

If you have a limited number of images, you can open all the photos one by one and compare these. It might seem a bit of a lengthy process, but it is effective. To make the process more efficient. You can use two image viewers to open multiple images together and compare them.

compare two images

The details such as sharpness, noise, and smoothness of your images matter a lot and can only be determined by looking at both similar photos simultaneously. Comparing images like this can take a lot of time and effort, which is not the most convenient way. That is why it is recommended that you use the technique with limited pictures or when you have ample time.

3. Use Third-Party Comparing Tool

If you have many images, you want to filter and compare for similarity. The best way is to use a dedicated application designed specifically for the purpose. Duplicate Photos Fixer Pro is one of the best tools that come to mind.

Using Duplicate Photos Fixer Pro, you can not only sort the images; you can compare them based on the seven criteria mentioned above. Yes, the tool uses an intelligent algorithm that allows you to get the best results. No matter if the images are exact duplicates or similar, the tool groups them together so you can mark and delete the ones you desire.

To give you a glimpse of how the tool performs the comparison, take a look at the steps in which it works –

  • Install the Software & Run it on Your PC.

Duplicate Photo Fixer Pro

  • Select the Folder with Similar Images That You Want to Filter.

adding duplicate photos

  • Click on Scan for Duplicates once you have added the photos to scan. Let the software run its algorithm to grab all the similar images and group them for your reference.

searcing duplicates

  • After the images are fetched, mark the images you want to select or use Auto Mark.

continue delete duplicate photos

Auto mark is a tool that allows you to use the algorithm to select similar photos automatically. It is a convenient feature that comes in handy when you have to sort similar from hundreds of images.

delete mark duplicate photos

  • After selecting the images, click on Delete Marked and then click on OK to allow the software to remove the rest of the photos

select and delete duplicate

  • After clicking OK, the process begins and automatically removes the images from the destination folder. Once the process is completed, you will be redirected to the below screen.

remove all duplicate

Using the tool is convenient and makes the process super smooth. Duplicate Photos Fixer Pro is a free-to-download tool that comes with a free trial that can be used to understand how the tool works. It means you do not have to invest in it without trying the effectiveness.

Parting Words

Comparing two images for similarity can become a tough job if you are working on a complete photo library. It takes time, effort, and an eye for detail. Using the tool is the best way to automate the process. Since the tool is designed well to make things work, you can depend entirely on the algorithm to choose similarities between the images.

Hope the blog gives you the answer to all your questions related to how you can compare two images for similarity. If you have any questions or suggestions to add, the comments section is all yours! Catch you at the next one, till then Good Luck!


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How To Delete Duplicate Photos In Google Photos
How To Delete Duplicate Photos From iCloud
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About The Author

Dishank Sharma
Dishank Sharma

A creative tech-writer who loves to explore latest tech-trends & convey them to his readers in the simplest way possible. He loves to blend the crispness of technology with a pinch of creativity while curating best practices for the readers. In his free time, he likes to scribble poetry, listen to rap & travel.

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