unfortunately, the DPI is not one of the parameters reported to the frontend via sane_get_parameters, so a backend that does not have resolution controls, or one that relies on the scanner to round the resolution will not report the right values.
allan On 2/15/08, Ren? Rebe <rene at exactcode.de> wrote: > On Friday 15 February 2008 00:44:27 m. allan noah wrote: > > you friend would be correct IF sane used a file format which allowed > > the storage of the dpi, or exposed this data through some external > > means. but, as i said before, sane does not. so, you are going to see > > a stretched image. > > > Of course depending on the frontend, Some do store the resolution in e.g. > TIFF files and/or scale the image correctly while embedding into a > PS/PDF. > > > > allan > > > > On 2/14/08, Gernot Hassenpflug <aikishugyo at gmail.com> wrote: > > > I cannot find the thread where this was discussed before, but here the > > > answer I received from a friend of mine, hopefully it will be useful > > > to clear up the confusion surrounding the resolution of scanners! > > > > > > - The lower figure (1200) is what is called True DPI. This is the more > > > important value. It stands for the density of the aligned sensors (the > > > more you have the better quality the scan output. This figure > > > represents the horizontal scanned resolution. > > > > > > - The higher figure (2400) stands for the vertical scanned resolution > > > and it is the steps the sensors are moving (vertically) in an inch. > > > > > > -> You confuse the out put which is square inch and therefore always > > > has the same horizontal and vertical figures. > > > > > > I hope that helps, > > > Gernot Hassenpflug > > > > > > > > > -- > > > sane-devel mailing list: sane-devel at lists.alioth.debian.org > > > http://lists.alioth.debian.org/mailman/listinfo/sane-devel > > > Unsubscribe: Send mail with subject "unsubscribe your_password" > > > to sane-devel-request at lists.alioth.debian.org > > > > > > > > > -- > > "The truth is an offense, but not a sin" > > > > > > > -- > Ren? Rebe - ExactCODE GmbH - Europe, Germany, Berlin > Gesch?ftsf?hrer: Susanne Klaus, Ren? Rebe > Sitz: Berlin, Amtsgericht Charlottenburg HRB 105 123 B > USt-IdNr.: DE251602478 > http://exactcode.de | http://t2-project.org | http://rene.rebe.name > -- "The truth is an offense, but not a sin"
