Creating metter profile manually

[Ray Lee]

Anyone have any idea how to create a metter profile in calman by comparing x,y reads from 2 metters?

The idea is to measure w,r,g,b on both metters and write down x,y coordinates of all 4 readings for both metters. Then do the math and manually edit the matrix cordinates in the calman meter profile screen. Is this possible? Anyone actually tried this?

• This topic was modified 1 year, 7 months ago by Ray Lee.

[Vincent]

Anyone have any idea how to create a metter profile in calman by comparing x,y reads from 2 metters?

Calman has a meter profiling workflow. Is it not preset in your setup?

The idea is to measure w,r,g,b on both metters and write down x,y coordinates of all 4 readings for both metters. Then do the math and manually edit the matrix cordinates in the calman meter profile screen. Is this possible? Anyone actually tried this?

IDNK actual XYZ to XYZ meter matching algorithm used by Calman, contat its support service.
You can find “Four-Color Matrix Method for Correction of Tristimulus Colorimeters” online, a PDF with the formula.
Also you can inspect ArgyllCMS code an do maths manually or even better, create manually measurement files and let ArgyllCMS/DisplayCAL compute them for you or  measure using DisplayCAL, create a 3×3 matrix  and copy XYZ to XYZ matrix to Calman (remember to use the same “mode” in calman)

[Ray Lee]

My Serial port is dead on spectro so I can only read manual data on lcd screen. So to squize life from it I could still use to to profile colorimeter but I need to do it manually now. I will try playing with DisplayCal maybe.

[Ray Lee]

There is no easy way in DisplayCal it seems. I was hoping of some easy tool that you simply enter x,y cordinates for both devices manually and it compute values for calman matrix. 🙂

This seems as a typical situation for older devices, I am puzzled because people probably encountered this problem in the past.

[Vincent]

There is no easy way in DisplayCal it seems. I was hoping of some easy tool that you simply enter x,y cordinates for both devices manually and it compute values for calman matrix. 🙂

It can, but you’ll have to write full TI3 file.
You can try to generate colorimeter TI3 file with GUI and then using it as sample, duplicate this file and paste CIE XYZ values for reference device in :

NUMBER_OF_FIELDS 7
BEGIN_DATA_FORMAT
SAMPLE_ID RGB_R RGB_G RGB_B XYZ_X XYZ_Y XYZ_Z
END_DATA_FORMAT

NUMBER_OF_SETS 4
BEGIN_DATA
1 100.0000 100.0000 100.0000 94.55593 100.0000 85.96319
2 100.0000 0.000000 0.000000 58.40967 27.45167 0.635473
3 0.000000 100.0000 0.000000 20.94112 66.49659 7.951611
4 0.000000 0.000000 100.0000 14.25506 4.944840 76.45361
END_DATA

(the last 3 cols, XYZ, col, for each WRGB col)

Then with this 2nd TI3 file created (copy & paste) manually you use DIsplayCAL GUI to generate 3×3 matrix.

It will be exported as a text file CCMX (XYZ to XYZ). Open and translate values to other tool.

This seems as a typical situation for older devices, I am puzzled because people probably encountered this problem in the past.

Since your reference spectro only outputs CIE xyY on its screen and no spectral information, it should be easier since you’ll create TI3 like if it was some kind of “reference colorimeter” with XYZ data.

• This reply was modified 1 year, 7 months ago by Vincent.
• This reply was modified 1 year, 7 months ago by Vincent.

[Ray Lee]

Thanks for effort and detailed response!

[Ray Lee]

There is FourColorMatrix.exe in the Calman folder that allows exactly this. So if anyone has similar issue this is the solution.

[Author]

Posts