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Discover how to extract images from Pandoc's self-contained HTML files and save them as JPEG or PNG files on your disk using the `--extract-media` option.
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Extracting Images from Pandoc's Self-Contained HTML Files

When working with documents generated by Pandoc using the --self-contained option, you might find that images are embedded within the HTML code using base64 encoding. While this format is convenient for certain applications, you may want to extract these images and save them as separate files on your disk for further use. In this post, we'll explain how to achieve that in a simple and effective manner.

Understanding the Issue

When you use Pandoc to convert documents to HTML with the --self-contained flag, images and other media are encoded directly within the HTML using base64. This results in image tags that look something like this:

[[See Video to Reveal this Text or Code Snippet]]

While this is great for keeping everything bundled into a single HTML file, it makes it challenging if you later want to work directly with those images. The aim here is to convert these base64 images back into standard image file formats like PNG or JPEG, and save them on your hard drive for easier access.

The Solution: Using Pandoc with --extract-media

To replace the base64 image data with file references and to extract the images into a designated folder, you can use the --extract-media option offered by Pandoc. This feature is straightforward to implement and works seamlessly for your needs.

Step-by-Step Instructions

Prepare Your HTML File: Ensure you have your self-contained HTML file ready. Let's call it YOUR_FILE.html for this example.

Choose a Directory: Create a directory where you would like to store the extracted images. For example, you can use a folder named images.

Run the Pandoc Command: Open your command-line interface (CLI) and enter the following command:

[[See Video to Reveal this Text or Code Snippet]]

What to Expect

Output Directory: The images will be saved in the images folder you specified.

Modified HTML: The original HTML file will have its base64 image tags replaced with src attributes that point to the PNG or JPEG files saved in the directory.

Benefits of This Approach

Simplicity: Using Pandoc's built-in features means you don't need to write complex scripts or rely on additional software.

Efficiency: Extracting images this way allows you to quickly access the files without manually decoding base64 strings.

Conclusion

Extracting images from Pandoc's self-contained HTML files doesn’t have to be a cumbersome task. By simply using the --extract-media option, you can efficiently retrieve and manage your images. Whether you’re working on projects that require standalone image files or just want to organize your media better, this method will save you time and effort.

Now, go ahead and try it out! Happy extracting!