Dangerzone is an implementation of a concept known as CDR (Content Disarm & Reconstruction), where you convert anything to an image inside a sandbox, and then convert the raw pixel data back into an image inside a different sandbox.
It is a common workflow inside the government or other places where you need to move data across airgaps, or view content that is highly untrusted.
Shameless plug, I wrote my own that supports over 200 file formats: https://preview.ninja/