No, it's not in plucker's format. It's in another tool's format.
I'm fighting with this converter to have it to generate thumbnails of images and allow them to be clickable to be inserted at the document. I'm only getting huge or very small pictures.
BTW, this Python converter does not support PNG images (at least it's not working here), so I had to write one shell script to convert everything to JPG.
Doing this reminds me of the time I worked with docs at Conectiva.