Hi, > I have got a scanner called Acer 620 ST. > It's running properly using the snapscan-backend. > sgcheck shows something like: FlatbedScanner17 > > My question is: > Why the xsane, saintwain or xscanimage frontends "just" provide the > maximum scanning resolution of 600 dpi, though the scanner itself > is capable to scan at 1200dpi (unfortunally only under Windows, > yet)? Is there a way to include that resolution as well?
The scanner has a resolution of 600x1200 dpi, i.e. the optical=20 resolution is 600 dpi whereas the stepper motor that moves the tray=20 has a resolution of 1200 dpi.=20 The backend is currently limited to the optical resolution of the=20 scanner. All higher resolution require an interpolation algorithm in=20 the backend, and I never got around to implement a decent one. It's=20 on my list though, but with very low priority. You also have to consider that the "real" resolution of the scanner is=20 probably less than the mechanical resolution anyway. There was a test=20 once in c't (german computer magazine) where they measured the real=20 resolution of scanners. Most scanners have difficulties in reaching=20 even 600 dpi, due to limitation of the optics involved. Regards, Oliver
