Extension for image conversion

[tfantina]

I'm wondering if you've considered an image conversion extension? For example if someone wanted to dither the posts in their images.

I imagine the API would look something like:

config :tableau, Tableau.DataExtension,
    enabled: true,
    dir: "assets/images",
    magick_options: ["-quality", "20"],
    format: "png"

It could run with pre_build/1 and iterate through post :body updating the file paths if needed.
If your interested I could open a draft PR for further discussion.

[mhanberg]

This sounds like a great opportunity for a third party extension!

I'm not sure I'd want to put this into the core library, but as a separate library it sounds great!