Compare Two Images and Highlight Differences C#
You might observe a puzzle game with two almost identical images side by side and slight or highly evident differences. These differences might range from a change in item color, shape, dimension, alignment, or position to the addition or removal of parts in one of the images and the viewer have to highlight those. If you want to implement such functionality via programming, you have come to the correct place. After reading this article, you will be able to effortlessly compare two images and highlight differences in C#. In the end, we will reveal a free tool to compare images for you as a bonus.

The following points will be 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 along with many other supported file formats. You can download the DLL or install this C# image comparison library using NuGet.

Install-Package Conholdate.Total

C# Compare Two Images and Find the Differences

In this section, we will explain the steps of comparing two images programmatically using our C# image comparison library. Please follow the steps below to compare any two JPG, PNG, or any other image.

  1. First, load the source image using the Comparer class.
  2. Then, load the second image using Add method of Comparer object.
  3. Finally, Call the Compare method to compare the two images and generate the resultant image that highlights the differences between them.

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

The following image 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 resultant image should be like below.
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. You can use a free image comparison tool online app without installing any extra software or signing up for anything. Let’s compare two PNG images, just open the online diff tool to compare PNGs in any of the latest browsers and start comparing images.

Online diff tool to compare PNG images

Compare Two Pictures Side by Side Online

How to Compare Two Images Online

  1. First, drag and drop or upload source and target PNG images using the respective box.
  2. Then, click on the Compare Now button.
  3. After that, you will be redirected to the comparison page which will show the resultant image.
  4. Finally, you can download or print the resulting image using the respective toolbar buttons.

You can repeat this image comparison process unlimited times for free. Plus, no registration or installation is required. Our protected server preserves the uploaded files, so you don’t have to worry about the safety or privacy of your files. Your submitted documents will be automatically erased from the server 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