sdyder 4 error after repeat calibrate !?

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This topic contains 6 replies, has 2 voices, and was last updated by  Florian Höch 6 days, 13 hours ago.

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  • #17379

    tawusaw
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    I have repeat calibration on same display and saw that. after done each calibration i measure whitpoint and repeat calibration and measure 1st  result whitepoint the coordinate move out from 0.3127,0.3290 result look more green and more green. This is error from Spyder 4? [ I have done 1hr LCD burn-in]

    #17380

    tawusaw
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    After every calibration it done with whitepoint stay close 0.3127,0.3290 but only each calibration. And value of another before more move from 0.3127,0.3290 and more move after repeat it. It is error. or it have more accuracy?

    #17416

    Florian Höch
    Administrator
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    Probably user error. What system? What exactly are you measuring and how? Calibration applied during measure or not?

    #17428

    tawusaw
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    Probably user error. What system? What exactly are you measuring and how? Calibration applied during measure or not?

    Maybe but i think not, i control all test to same setting, i test it by your virtual white point reader from another pc to measure this pc (use white level measurement to show white point in this pc, already check first profile installed). and found that when i use same first profile but white point was change significantly by time it not much but can saw it when i campare to my ref display. (this display can’t adjust RBG value before calibrate and result show green effect better than my ref monitor)  my result show as this graph https://www.desmos.com/calculator/w6zlwd0alb (measure white point of my first profile) maybe display color change by time but result of Spyder more green after repeat calibrate.

    #17432

    Florian Höch
    Administrator
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    So I assume in the linked page the 2nd table are your measured chromaticities:

    0.3127 0.3294
    0.3124 0.3292
    0.3118 0.3289
    0.3117 0.3288
    0.3110 0.3290

    So, the highest variance is 1.12 CIEDE2000 (1st xy 0.3127 0.3294 vs 5th xy 0.3110 0.3290). What’s the timeframe over which those measurements have been taken? Is it a LED backlit or CCFL backlit LCD?

    #17467

    tawusaw
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    So I assume in the linked page the 2nd table are your measured chromaticities:

    0.3127 0.3294
    0.3124 0.3292
    0.3118 0.3289
    0.3117 0.3288
    0.3110 0.3290

    So, the highest variance is 1.12 CIEDE2000 (1st xy 0.3127 0.3294 vs 5th xy 0.3110 0.3290). What’s the timeframe over which those measurements have been taken? Is it a LED backlit or CCFL backlit LCD?

    I forgot to record the time. It have time different around 45min per value . It is LCD white LED. The result are same as other laptop that i test ( gradient pic look green more than standard monitor it happen only display that cant adjust RGB value before calibrate ). Is it possible to correct white point and apply white correction profile before start calibration (apply white point correction while measure for calibration) and combine calibration profile with white point correction profile later.

    • This reply was modified 1 week ago by  tawusaw.
    #17491

    Florian Höch
    Administrator
    • Online

    Enable white level drift compensation, and/or let the instrument warm up on the display longer.

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