Compare Two Images and Highlight Differences C#
You may have seen a puzzle game that shows two nearly identical pictures side by side, with subtle or obvious differences. These differences can be changes in color, shape, size, alignment, position, or the addition or removal of elements. If you want to add this functionality to your own software, you are in the right place. After reading this article, you will be able to compare two images and highlight differences in C#. At the end, we will also share a free tool for online image comparison.

The following points are covered in this article:

Installing C# Image Comparison Library

We will use Conholdate.Total for .NET to compare two images and find the differences programmatically. This library supports comparing JPG, PNG, BMP, DjVu images and many other supported file formats. You can download the DLL or install this C# image comparison library via NuGet.

Install-Package Conholdate.Total

C# Compare Two Images and Find the Differences

In this section we explain how to compare two images using our C# image comparison library. Follow these steps to compare any JPG, PNG, or other image format.

  1. Load the source image with the Comparer class.
  2. Add the second image using the Add method of the Comparer object.
  3. Call the Compare method to generate an image that highlights the differences.

The code below shows how to find difference between two images in C#.

The following figure shows the source and target images side by side.

C# Find Difference Between Two Images

C# find difference between two images

After running the code, the result looks like this.
C# Compare Two Images and Highlight Differences

Compare Two Images and Highlight Differences using C#

Compare Two Images and Highlight Differences Online

To find difference between two images online, use a free image comparison tool online without installing software or creating an account. Open the online diff tool to compare PNGs in any modern browser and start comparing.

Online diff tool to compare PNG images

Compare Two Pictures Side by Side Online

How to Compare Two Images Online

  1. Drag and drop or upload the source and target PNG images.
  2. Click the Compare Now button.
  3. You will be taken to a page that displays the result image.
  4. Download or print the result using the toolbar buttons.

You can repeat this process unlimited times for free. No registration or installation is required. Our secure server stores uploaded files temporarily, and all files are deleted after 24 hours.

FAQs

How to use the free online image comparison tool?

First, upload source and target images: drag & drop your PNG files or click inside the white area to choose a file. Then click the “Compare now” button.

What browser should be used for the free online image comparison tool?

We support all the latest browsers, such as Chrome, Safari, Opera, Firefox, Edge, and Tor.

What are the supported image formats by the C# image comparison library?

This library supports comparing JPG, PNG, BMP, DjVu images along with many other supported file formats.

How can I create my image comparison app using C#?

Feel free to use our Conholdate.Total for .NET library.

Can I get a license to evaluate the libraries?

You can acquire a free temporary license to test the API without evaluation limitations.

Ask a Question

You can let us know your questions or queries on our forum.

See Also