[sane-devel] meaning of 1200x2400 etc. explained

[René Rebe]

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
> >
> >
> >  --
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> >
> 
> 
> -- 
> "The truth is an offense, but not a sin"
> 



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