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

Gernot Hassenpflug aikishugyo at gmail.com
Thu Feb 14 22:42:18 UTC 2008


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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