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

[m. allan noah]

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, René 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
>  > >
>  > >
>  > >  --
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>  >
>  >
>  > --
>  > "The truth is an offense, but not a sin"
>  >
>
>
>
>
> --
>   René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
>   Geschäftsführer: Susanne Klaus, René Rebe
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>


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