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

[Philippe Dumont]

> 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
>>>
>>
>>