From what I've heard, the scanning head reads two adjacent pixels at a
time, and then moves on by two positions. One data stream is all the odd
pixels, the other is all the even pixels. This means the mechanism can be
twice as coarse as the true resolution. HP has a fancy name for it, which I
forget.
Sorry I can't give you any more information. I got this from someone at HP,
whose main specialty actually wasn't scanners.
Mark
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Am Son, 06 Feb 2000 schrieben Sie:
> Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de> on 07/02/2000 05:32:15
>
> >>The scanner reports two sources of data. I am not sure
> >>whether I am reading from the correct one, or even if I need to do some
> >>weirder stuff.
> ......
>
> >>I am going to try to read from the other source, unless I get better
> ideas.
> >>I'd appreciate links to tools. I know C but neither USB nor scanners.
> >>Please, please suggestions !?
>
> I've been told that the reason you're seeing this, is that HP scanners
use
> two interpolated sources of scan data, to double the resolution (this
could
> be wrong, but it makes sense...).
Is that true for Microtek, too ?
> If this is the case, then you need to read both data streams, and
> interpolate the pixels - otherwise, you'll get a picture which looks
almost
> correct - but not quite...
But what would I want to read an interpolated stream for?
In addition I get no data at all.
Could you please elaborate ?
>
> --
> Hope this helps,
> Mark
> --
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