[sane-devel] Epson Perfection V200 Photo - scans White as Blue

[Olaf Meeuwissen]

"emmanuel.michel at wanadoo.fr" <emmanuel.michel at wanadoo.fr> writes:

> Le 09/05/2012 10:21, 2cv67 a écrit :
>> These are the examples used in the above post:
>> Uncorrected:
>> http://s838.photobucket.com/albums/zz309/2CV67/?action=view&current=xs_normal.jpg
>>
>> Corrected:
>> http://s838.photobucket.com/albums/zz309/2CV67/?action=view&current=xs_white.jpg
>>
>> I am not looking for "perfect" white, but what I get is nowhere near
>> white - on screen or in print.
>
> OK, I see what you're talking about and I must say my V200 scans under
> Linux (Ubuntu 10.04) look much like your uncorrected version,
> unfortunately. If the corrected version is exactly what you obtain
> from the same document using XP (is it?), then there really seems to
> be a problem with the Linux scan (settings ?).
>
> I just use my scanner from time to time, for simple docs scans, no
> critical graphic applications, and never used it with Windows so I've
> never paid attention to this color. Now, I'm with you on the same
> boat!
>
> I hope some specialist of EPSON or Avasys will be able to give us a
> hint about the root cause of this problem. Anyone? :-)

You may get improved results with Image Scan! for Linux when selecting
Color Document (or B/W Document) for the Image Type.

This white correction is not done by the device.  It is all done in a
non-free software component used by the iscan frontend.  The Image Type
setting influences this image processing, but may still not be able to
arrive at the desired result.  Your only option remaining (within the
scope of iscan) is fiddling with the Tone Correction settings.

# That non-free software component has not been updated for ages.  The
# Windows driver however has seen additions and improvements in that
# area, hence the whiter backgrounds.

Hope this clarifies,
-- 
Olaf Meeuwissen, LPIC-2           FLOSS Engineer -- AVASYS CORPORATION
FSF Associate Member #1962               Help support software freedom
                 http://www.fsf.org/jf?referrer=1962