Using ColorCech Digital SG to calibrate scanner
Opened this issue · 4 comments
I hope it is correct place for this.
I have ColorCech Digital SG and i wont use it to calibrate my scanner. But Calibration files since there is no shared-color-target for this. Is it possible to fix it? Can i some how help with it?
On 12 September 2013 08:02, Oleksij Rempel notifications@github.com wrote:
I have ColorCech Digital SG and i wont use it to calibrate my scanner. But Calibration files since there is no shared-color-target for this.
Is that the same as the ColorChecker SG? If so there's a template
already in gnome-color-manager, but you have to install the argyllcms
package before you do that. shared-color-targets just contain the
measured values for the color charts from Wolf Faust.
Richard
Hmm... i installed argyllcms but result what i got is absolutely wrong :(.. Probably i do some thing wrong.
I scanned image in ttf format with xsane. (suddenly GCM did't said any thing about needed format...) then i choiced cie file from agryll. There was only ColorChecker and ColorCheckerPasport. Both of them didn't complained about errors and created some wired profile.
Am 12.09.2013 10:03, schrieb Richard Hughes:
On 12 September 2013 08:02, Oleksij Rempel notifications@github.com wrote:
I have ColorCech Digital SG and i wont use it to calibrate my
scanner. But Calibration files since there is no shared-color-target for
this.Is that the same as the ColorChecker SG? If so there's a template
already in gnome-color-manager, but you have to install the argyllcms
package before you do that. shared-color-targets just contain the
measured values for the color charts from Wolf Faust.
In attachemnt are jpeg version of ttf scan and icc profiles created with GCM
Regards,
Oleksij
I think i know now why it is not working. Agryll package do not provide ColorCheckerSG.cie file. Probably some licensing issue:
"The ColorChecker SG is relatively expensive, but is preferred by many people because (like the ColorChecker and ColorCheckerDC) its colors are composed of multiple different pigments, giving it reflective spectra that are more representative of the real world, unlike many other charts that are created out of combination of 3 or 4 colorants.
A limited CIE reference file is available from X-Rite here, but it is not in the usual CGATS format. To convert it to a CIE reference file useful for scanin, you will need to edit the X-Rite file using a plain text editor, first deleting everything before the line starting with "A1" and everything after "N10", then prepending this header, and appending this footer, making sure there are no blank lines inserted in the process.
If you do happen to have access to a more comprehensive instrument measurement of the ColorChecker SG, or you have measured it yourself using a color instrument,
then you may need to convert the reference information from spectral ColorCheckerSG.txt file to CIE value ColorCheckerSG.cie reference file, follow the following steps:"
Probably GCM should disable this profile or notify about it.