[sane-devel] [plustek] [xsane] Color not consistent or correct

[Henning Meier-Geinitz]

Hi,

On Sun, Mar 02, 2003 at 08:56:35AM +0530, ionmich at indiainfo.com wrote:
> Hello Henning,
> 
> In your previous message you said:-
> 
> >Scanner - Epson Perfection 1250. Do you use the plustek or
> >Epson Kowa backend?
> 
> I am using the plustek backend.

Then it's either a plustek backend or xsane problem.

> >What's the difference between you xsane and xscanimage installations?
> >Did you install one of them from source and the other from RPM?
> 
> If xscanimage is part of sane-frontends-1.0.10.tar.gz then they
> were both installed from source.

Ok.

> >Check the "/usr/local/lib" is in /etc/ld.so.conf.
> 
> It was not. The reference was to "/usr/lib". I changed it to
> "/usr/local/lib". I invoked xscanimage. I got the same error
> message...xscanimage: error while loading shared libraries:
> libsane.so.1: cannot open shared object file: No such file or
> directory. 

Check with "ldd /usr/local/bin/xscanimage" to which shared libraries
xscanimage points.

And check that you really use xscanimage from /usr/local/bin not an
old version from /usr/bin.

> >What happens if you don't use XSane's automatic film setting
> >but set up the colors manually? I.e. use the invert button and
> >change the gamma/brightness for the colors so the image looks
> >correctly? I'm trying to find out if it's a xsane or backend
> >problem.
> 
> I'm not sure I understood your instruction, but here is what I
> did. I set it to negative (document source), Fuji negative
> (source medium type) and prescanned. The prescan came out
> pretty close to real life. I then manually adjusted the gamma
> etc. to make the preview look as close as possible to real
> life. When I final scanned I got a very different scan from the
> preview (saturated, extreme reds etc.) but subsequent scans
> were identical. This is a change.
> 
> I then set it to transparency, full color range, reverse and
> prescanned. The resulting pre-scan was too washed out to be
> adjustable. This makes sense as transparencies are always
> darker than  negatives.
> 
> I know nothing about scanning software but I find it significant
> that if I prescan several times without touching any other
> buttons etc. I get scans of different colors different contrast
> etc.

Yes, that sure sounds like a bug. I don't have problems with xsane's
film settings so I would assume that it's a plustek bug. But it's
difficult to decide from here.

Bye,
  Henning