correction using an unsupported spectrometer

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  • #8303

    Antonio Marcheselli
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    Hi there,

    Can I create a correction file for my i1 Display using an unsupported reference spectrometer (typing values manually)? The UI only allows to use a detected instrument.

    Thanks

    Tony

    #8308

    Florian Höch
    Administrator
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    Hi,

    this is currently not possible via the UI, but you can manually enter the measured values in a copy of an existing TI3, e.g. by copying the one from the colorimeter readings and over-writing the XYZ values. You can then select this file in the colorimeter correction creation dialog.

    #8368

    Antonio Marcheselli
    Participant
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    Thank you.

    Is there a way to manually play the charts used by the process?

    Alternatively I could put the i1 on a black surface so each chart stays several seconds on screen, allowing me to take a reading with the reference instrument.

    Thanks

    #8369

    Florian Höch
    Administrator
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    Is there a way to manually play the charts used by the process?

    Yes, and it should work on Linux and Windows, under OS X, the system-wide color management may interfere.

    First, reset the video card gamma table (menu “Tools”). Then, select the “Untethered” display on the “Display & instrument” tab. On the “Profiling” tab, select the testchart for colorimeter correction. Then, choose “Measure testchart” from the advanced sub-menu in the “Tools” menu.

    #8752

    Antonio Marcheselli
    Participant
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    Hi Florian,

    Back on this subject – I’m only attempting a calibration now: on the manually amended ti3 file, shall I change the NORMALIZED_TO_Y_100 “YES” to “NO”? I don’t think my Y values are normalised to 100. However if I change that field on the amended ti3 I get totally wrong Y values on the summary table at the end. Leaving it to NO seems to work.

    Anything else I need to change on that file besides the name of the instrument and the 4 WRGB readings? I had to change the INSTRUMENT_TYPE_SPECTRAL to “YES” for the software to work or it would say that ‘exactly one reference measurement is needed’. I guess that makes sense, it cannot be a reference measurement if the instrument is not a spectrophotometer, correct?

    Cheers

    #8754

    Antonio Marcheselli
    Participant
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    addendum: no, my brightness was totally wrong. I normalised my values to the white Y and all seems good now.

    #8838

    Antonio Marcheselli
    Participant
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    Sorry Florian, I was wondering if you could confirm that my approach used to modify the ti3 file is correct.

    Thanks

    Tony

    #8839

    Florian Höch
    Administrator
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    Yes, you did the right thing.

    #36202

    Antonio Marcheselli
    Participant
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    Hello Florian – forum,

    Bringing up this old thread I started as with a new TV I need a new correction.

    I did my last correction in 2017 so I am basically starting from scratch…

    I believe I followed the above directions:

    • Taken readings with my reference CR300 spectrometer
    • Amended a TI3 file with the XYZ readings. XYZ normalised so that White Y reads 100
    • I loaded that file under the calibration screen and read the patches with my i1Display.
    • When it’s done it’s giving an error which I attach.

    Also – as I cannot remember – what do I put under LUMINANCE XYZ CDM2? I feel it may be White XYZ but not normalised, is that correct?

    I’m attaching the TI3 file I have used.

    Thank you!

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