**YouTube** is an American [online video-sharing](https://en.wikipedia.org/wiki/Video_hosting_service "Video hosting service") [platform](https://en.wikipedia.org/wiki/Web_platform "Web platform") headquartered in [San Bruno, California](https://en.wikipedia.org/wiki/San_Bruno,_California "San Bruno, California")

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**What**

Activities that output an image file can have their results checked using an image comparison algorithm. The simplest of these is a pixel-by-pixel check for equality. More complex algorithms that take an error metric based threshold parameter can also be used. The latter are implemented using the [Magick.NET](https://github.com/dlemstra/Magick.NET) library's _**Compare**_ method.

  

**Who**

RPA developers, although QAs can also use it to run image specific scenarios.

  

**How**

Drag and drop the **Compare Two Image Files Pixel By Pixel** activity from under the _**UIPathTeam &gt;**_ _**Images**_ node. Locate the two image files to be used in the comparison.

The activity returns a boolean that indicates whether or not the two inputted files are identical.

  

Drag and drop the **Compare Two Image Files Using Threshold** activity from under the _**UIPathTeam &gt; Images**_ node. Locate the two image files to be used in the comparison. Choose one of the available **ErrorMetric** values. An explanation regarding metrics can be found [here](http://www.imagemagick.org/Usage/compare/#statistics). Set the required **Threshold** value. This represents the upper bound of the distortion based on the selected **ErrorMetric** for the two input images to be considered equal. The activity returns returns the computed **Distortion.** It also returns a boolean that indicates whether or not the two inputted files are equal based on the computed distortion and the **Threshold** value.

  

The supported image file types are:

*   PNG
*   JPEG
*   BMP
*   GIF
*   TIFF

A package containing activities for comparing image files

Image Activities - Image Comparison