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mkdocs-material/docs/setup/dependencies/image-processing.md

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Image processing

Material for MkDocs depends on several libraries to allow for image processing as part of the build pipline, including social cards and image optimization. For this reason, a few external libraries must be installed on the host system. This section explains how to install them.

Dependencies

Cairo Graphics

Cairo Graphics is a graphics library and dependency of Pillow, which Material for MkDocs makes use of for generating social cards and performing image optimization. See the following section which explains how to install Cairo Graphics and its dependencies on your system:

=== ":material-apple: macOS"

Make sure [Homebrew] is installed, which is a modern package manager for
macOS. Next, use the following command to install all necessary
dependencies:

```
brew install cairo freetype libffi libjpeg libpng zlib
```

=== ":fontawesome-brands-windows: Windows"

As stated in the [installation guide], the easiest way to get up and running
with the [Cairo Graphics] library on Windows is by installing [GTK+], since
it has Cairo as a dependency. You can also download and install a
precompiled [GTK runtime].

=== ":material-linux: Linux"

There are several package managers for Linux with varying availability per
distribution. The [installation guide] explains how to install the [Cairo
Graphics] library for your distribution:

=== ":material-ubuntu: Ubuntu"

    ```
    apt-get install libcairo2-dev libfreetype6-dev libffi-dev libjpeg-dev libpng-dev libz-dev
    ```

=== ":material-fedora: Fedora"

    ```
    yum install cairo-devel freetype-devel libffi-devel libjpeg-devel libpng-devel zlib-devel
    ```

=== ":fontawesome-brands-suse: openSUSE"

    ```
    zypper install cairo-devel freetype-devel libffi-devel libjpeg-devel libpng-devel zlib-devel
    ```

The following environments come with a preinstalled version of Cairo Graphics:

pngquant

pngquant is an excellent library for lossy PNG compression, and a direct dependency of the built-in optimize plugin. See the following section which explains how to install pngquant system:

=== ":material-apple: macOS"

Make sure [Homebrew] is installed, which is a modern package manager for
macOS. Next, use the following command to install all necessary
dependencies:

```
brew install pngquant
```

=== ":fontawesome-brands-windows: Windows"

Installing [pngquant] on Windows is a little more involved. The 
[pngquant-winbuild] repository contains a guide on how to set up an 
environment for building [pngquant] on Windows.

=== ":material-linux: Linux"

All popular Linux distributions, regardless of package manager, should
allow to install [pngquant] with the bundled package manager. For example,
on Ubuntu, [pngquant] can be installed with:

```
apt-get install pngquant
```

The same is true for `yum` and `zypper`.