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The final standard sort of image in MuPDF (though more types may of course be added in future) is that based upon a display list.
We use this to easily embed one file format within another. For example, EPUB files frequently contain SVG images for title pages. We open the SVG image as a separate document, run it to a display list, and close the document. We can then create an image from the display list, and use this in the HTML flow of the EPUB document.
These images maintain the properties of the original (vector-based) document in that they remain scalable even after conversion to an image.