| # External tools

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## Chapter 3. External tools

You can easily extend Gwenview by defining external tools. These tools are accessible from the contextual popup menu which appears when right-clicking on a thumbnail or in the image view. Look in the External Tools entry.

Gwenview comes with a few predefined external tools, but it's very easy to add more through the Configure External Tools dialog. You can open it from Settings->Configure External Tools....

Here is how it looks:

In this example, I defined an external tool which will call Exiftran to regenerate the EXIF tags for JPEG images. Here is a more detailed description of its definition:

- The Name: field contains the description of your tool, has it will appear in the menu.

- The Command: field contains the command which will be run when this tool is invoked. Click on the little question mark on the right of the field to get a list of the keywords you can use in this field. These keywords will get expanded to the image files.

- The button on the right lets you associate an icon with your tool.

- The File Associations group indicates what type of files this tool can work with. Your tool will only appear in the External Tools menu if the selected files are of the correct type. In my example, this tool is only valid with JPEG images, so I choose Custom:, then image/jpeg and image/pjpeg.

### Tip

You can find other external tool examples from Gwenview web site.