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

[Philippe Dumont]

Hello,

I have recently scan a photo under linux and I notice (it was not the 
first time) that the colors were too dark, tern.
So I have scanned it under windows and the colors were good.

Linux scan : http://vrac.dumontweb.com/scan-bad.jpg
Windows scan : http://vrac.dumontweb.com/scan-good.jpg

So i have tried to calibrate it using the option calibration in xsane 
but it has changed nothing. After I have seen that I need to make a fine 
calibration using gamma/contrast/luminosity.
But I am far from being a specialist and I have a lot of difficulties to 
  obtain a good result. I succeed to improve the colors but it is not 
perfect :(((

I have also try to understand how the calibration works and why windows 
is able to produce a good result. I think that I have understand how it8 
/ icc / icm work. So I have retrieve the icc file for my scanner under 
windows and I have tried to apply it.
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.

Do I have understood how it works ? Can I apply an icc file to my image 
? And how ?
If it is not possible, how can I easily make a fine grain calibration ?


Thanks a lot in advance for all your answer.

Philippe

OS : linux  2.6.16.19 SMP PREEMPT
scanimage (sane-backends) 1.0.18; backend version 1.0.18
scanner : canon lide 30