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

[m. allan noah]

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.

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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