[sane-devel] calibration / icm / it8 and colors problems

[Gerard Klaver]

On Mon, 2007-01-15 at 20:19 +0100, Philippe Dumont wrote:
> > Did you try this sequence:
> > convert <filename.png> -profile scanner.icc -profile monitor.icc <new
> > filename.png>
> > 
> 
> >> CNZ005.ICC is the wrong profile. CNS12I.ICC is for your scanner.
> >> But you need the same brightness, contrast, gamma, ... settings as the
> >> windows driver before applying the profile.
> >> You'll get better results if you create your own profile in Linux.
> 
> 
> Thanks for your answers ! With the good profile and with this command 
> line, the scanned picture is better but it is still far from being perfect.
> I think I will follow your advice and I will buy a IT8.7 scanner 
> calibration targets. I have found some on this website 
> http://www.targets.coloraid.de/
> Promise, I will post the result of my calibration:)
> 
> Philippe
> 
> 
> 
> 
> 
> > m.vr.gr.
> > Gerard Klaver
> > 
> > On Sun, 2007-01-14 at 11:58 +0100, Philippe Dumont wrote:
> > 
> >> I am sorry but it does not work :(
> >> I seems to be the good solution according to the paper I have read.
> >> Is it a problem of icc profile, or a problem in sane ?
> >>
> >> Best regards
> >>
> >> Philippe
> >>
> >>
> >> OS : linux  2.6.16.19 SMP PREEMPT
> >> scanimage (sane-backends) 1.0.18; backend version 1.0.18
> >> scanner : canon lide 30
> >>
> >>
> >>
> >>
> >> Daniel Glöckner a écrit :
> >>> On Thu, Jan 11, 2007 at 11:50:49PM +0100, Philippe Dumont wrote:
> >>>> I have done :
> >>>> scanimage -i cnz005.icc --resolution 600 > image.tiff
> >>>> or
> >>>> convert -profile cnz005.icc before.tiff after.tiff
> >>>> But nothing happened and the image was still the same.
> >>> You need a viewer that knows how to deal with embedded ICC profiles.
> >>>
> >>> If want it to work in all viewers, you need to convert the image to your
> >>> destination colorspace (you want sRGB):
> >>>
> >>> scanimage -i cnz005.icc --resolution 600 > image.tiff
> >>> AND
> >>> convert -profile sRGB.icc image.tiff after.tiff
> >>>
> >>> http://www.color.org/ -> Resources -> Profiles
> >>>
> >>>   Daniel
> >>>
> >>
> >>
> 
> 
> 

One program to make profiles is the lprof package
http://lprof.sourceforge.net/

Also the lprof package is placed in some distributions (at least Debian)
-- 
--------
m.vr.gr.
Gerard Klaver