In <URL:news:local.opro> on Wed 28 Nov, Tim Powys-Lybbe wrote: > In message of 28 Nov, Dave Barnett <dave@xxxxxxxxxxxxxxxxx> wrote: > > > In a recent message David Pilling <flist@xxxxxxxxxxxxxxxxxxx> wrote: > > <snip> > > > > Dan made a good point. Moire patterning can also be due to the > > > monitor screen - the magnify tool in DPscan has a button "rational" > > > which gets rid of such effects by displaying one image pixel per > > > screen pixel. > > > > > That has no effect. Increasing dpi above 100 increases problem. I am > > happy with results for this image. > > > > OT ? One thing that I have found for DPscan is that increasing the > > 'Next' bar on the Task display reduces the incidence of 'Type 5' > > errors. > > I would expect that the above problem and resolution only applies to > screen images. When you print, there should be a significant > improvements at 300 dpi compared to 100 dpi. (Unless your printer is a > dot-matrix and restricted to 80 or so dpi.) > I usually scan at 150 dpi for a 600dpi printer and print with a half-tone screen of 90 lpi or 65 lpi if the output is to be reduced on a photocopier. If scanning for screen use I'd probably drop to 100 dpi or less. Anthony -- ajh@xxxxxxxxxxxxxxxxx