Digital BW, The Print

I have followed this and the earlier discussion about what resolution printers resample  
images to in preparation for dithering.  

My question is as follows:  if the Epson desktop printers resample to 720ppi, is there 
any advantage to sending the printer images at 720ppi in the first place?  By this I 
mean either not downsampling below 720ppi (if enough pixels are available from, say, 
the scan to meet the required image dimensions at 720ppi) or using PS to do the up-
sampling rather than the printer driver.  I am using an Epson 2100.


> > My question is...the images from my Canon A80 routinely show as 180ppi
> > when shown full size in Photoshop.  I would like to print them at a
> > higher resolution, but same number of inches.  Does it do any good to
> > resample for higher resolution?
> 
> Not usually. On some printers, certain images that have fine regular detail
> may result in moire if the resolution doesn't divide evenly into the
> resolution of the printer. For instance, Epson desktop machines resample
> everything to 720ppi and the wide format ones resample to 360ppi, using
> "nearest neighbor". Dunno what Canon does. But images that show moire are
> rare. Be aware, though, that fixing this only requires resampling to a
> submultiple of the printer's resolution.
> 
> If you have an image that has really sharp edges in it, you might be able to
> improve the sharpness of large prints by using the Genuine Fractals file
> format. You save the file, then reload it at a larger resolution, and it
> manages to translate some of the highest spatial frequency components
> upwards so that sharp edges remain sharp at the higher resolution. But
> remember that it's really inventing image data, in a manner that works well
> sometimes but not always.
> 
> --
> 
> Ciao,               Paul D. DeRocco
> Paul                mailto:pderocco@i...