> Laurie Solomon wrote: > > You should not need to upsample at all to resize a 4x5 at 2400 ppi to > 13x16.25 at 600ppi which is more than enough. The 720 dpi figure > that Epson uses is really not to be taken literally since it is an > extrapolation of the what the approximate resolution is after > dithering and is accomplished not in terms of actual imputs but in > terms of what goes on within the printing process by the printer > regardless of the input resolution. In terms of actual input > resolution, the 720 is equivalent of from 200 dpi to 300 dpi before > dithering.
The 720dpi figure (360 for large format printers) is the exact resolution that the Epson driver converts to _before_ dithering. After dithering, it is some multiple of that. And since the conversion to 720dpi is an unfiltered conversion, there are situations where it causes visible aliasing, and you get better results by manually resampling. -- Ciao, Paul D. DeRocco Paul mailto:pderocco@;ix.netcom.com ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
