Newspaper print only
has to be 160 dpi and with that fractal-based images enlargement software, it's not too difficult (I should imagine)
( Nath, Tue 6 Jul 2004, 10:12, archived)

The probably use S-Spline.
But now they call it PhotoZoom, or so the site says. Tsk.
( RarelyEvil, Tue 6 Jul 2004, 10:24, archived)