from the HP Indigo Press features:
Lower cost on runs from 10 to 500
is meant by a "sheet"?) :
The HP Indigo Press uses direct to press imaging technology,
bypassing film, plates and "make-ready" steps of traditional
offset printing. This translates
into cheaper cost per sheet over conventional printing on runs
up to 500 sheets.
Ink, smooth finish:
The HP Indigo
Press uses industry
standard offset inks to image your creative designs to paper for
a smooth professional finish. Other direct to press technologies
use thick plastic toners or non-standard inks which leave a waxy
or odd appearance.
data custom printing: Each printed
sheet is imaged and printed in one step on the The
HP Indigo Press. This
means each and every page is a unique print and can be customized
using a database. The variable data feature includes in-line text,
photographs and artwork. Some possible uses for variable data
printing are on-the-fly addressing of postcards and mailers and color certificates.