Andrea,
Search Google images for Jurassic Park Trilogy HDTV rip, you'll find 1.78:1 open-matte images.
If you want to download a open-matte print, here you go-
http://1337x.org/torrent/196526/0/
Screenshots are also provided. This is taller and wider than the wowow and 2D BD version, but less so than the LD one. Its not big in size, you'll need a torrent client like utorrent (available for free) to download this!
Open-matte prints for JP2 and JP3 are also available from the same series (just replace the title names).