[sane-devel] Re: Re: Re: epson 3490 - transparency unit problem
lnovak at dragon.unideb.hu
Tue Nov 15 07:48:05 UTC 2005
On Mon, 2005-11-14 at 19:08 +0100, patrick deflandre wrote:
> I have try the 2 methods, but I always have a green line across my scan.
> This line is few pixel wide.
> I can send you an example if you like.
Two vague ideas (if the green line is vertical):
- defective sensors (maybe a quality calibration would help a bit)
- dirt on the calibration stripe or windows. Even a small dark spot on
the area where shading correction is done could have a big impact, as
it gets applied over and over for the whole scan height.
Especially because you mentioned that the higher the resolution the
wider the line. I would suspect a physical cause then.
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