# How to compare images

Beyond Compare can open image files:

![Differences in red: extra salt and a missing Morton trademark](https://1446155253-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LXUX-uoaZJ8T4qyEc-x%2F-LXUmiyna8u_BQ3BcKQC%2F-LXUnDopMOEaXvVAdL5Z%2Fimage-morton%20\(4\).png?alt=media\&token=210535db-c408-499b-8ee0-93fa3743b890)

Caveat: If the images are different sizes Beyond Compare will not stretch or resize them for you.  It is meant as a pixel comparison, so resizing wouldn't really make sense anyway.  

### To get started: 

Drag two images into Beyond Compare.  If the filenames end in .jpg, .gif, .tiff, or similar the software will detect the file extension and open them in a Picture Compare session.

The first two controls you should start with are (1) press the Tol (tolerance) button and then play with the tolerance slider.

(2) Flip rapidly between Image A and Image B by hitting the F8 key in Windows or with your mouse: ![](https://firebasestorage.googleapis.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LXUX-uoaZJ8T4qyEc-x%2Fuploads%2Fns2FnYuj1dVnwVOZv0sb%2Ffile.png?alt=media) and ![](https://firebasestorage.googleapis.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LXUX-uoaZJ8T4qyEc-x%2Fuploads%2FQ4mmpzOrmOlwgOc6ygQ0%2Ffile.png?alt=media)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://beyondcompare.gitbook.io/project/other/how-to-compare-versions-of-images.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.