# Re: Scan Area & Origin (4.5.2)

becka@sunserver1.rz.uni-duesseldorf.de
Fri, 14 Mar 1997 01:18:29 +0100 (MET)

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> +-+ +-o
> Mine | | HP | |
> o-+ +-+

> The rulers and a big red arrow both correspond to this. On one of the HP
> scanners here that I looked at, the origin in is the back right side (but
> the element is stored in the back also).
> Now to the actual question.. I noticed in section 4.5.2 of the SANE
> Project docs that the origin is specified as the back left corner.I have
> no problem with converting scanning co-ordinates or changing bits around
> for BW/Halftone scans, but I'm wondering if this should be somehow
> corellated (sp?) to where the light element and CCD array start from.
Yes. It is intendend as it is normally used with the specific type of scanner.

The SANE-coordinates are meant as correlated with the picture you want to
scan. The hardware of most scanners will "suggest" an efficient way of
doing it. I.e. the logical top-left of the picture you scan should be
positioned in a way that it is in the same place on a "full-scan" regardless
of how big the picture is.

This normally means that the "top" should be oriented at the edge near the
CCD-home-position and "left" should touch the corresponding border ...

I.e. I would consider your scanner to be just a "turned round" version of
the HP one (or one with the lid attached on the other side) and not try
to "soft-emulate" another hardware-layout.

CU,Andy

    --
    Andreas Beck              |  Email :  <becka@sunserver1.rz.uni-duesseldorf.de>
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