A client of mine has just requested some scans from me for a series of posters which are going to be 88cm high, & say that the scans should be 300dpi. This equates to a file size of over 300MB from an uncropped 6x6 neg.
Are you worried about the scale of enlargement or the file size? I can't see why the latter should worry you.
Is this right, or a bit of over specification?
What would be the "norm" in terms of DPI for printing posters at this size?
It depends on the screen ruling (i.e. whether it's "art quality" poster or a adshel type poster). For the former you'd need 300 ppi (for a 175 screen), for the latter you could get away with 120 ppi for a 60 screen. Some of the latter are printed at higher quality though so I'd be inclined to check first.
Mike -- Mouse in the House, London http://www.mouseinthehouse.co.uk =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
