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Re: Calibrate to wrong color temperature

2012-12-22 by gerard_culemborg

Thanks again for the answers.

I did not actually try to do a calibration to 6500K based on a 9300K hardware setting. I just did this to verify that the color temperature did not really changed in my system (soemthing that should be obvious with this large separation in color temperature). The reason why I did this was that when I put the hardware on 6500K and tried to calibrate to 6500K, it consistently stayed at 6900k or 7000K in the advanced analysis done right after the calibration, so I was wondering if the calibration was not done right or something else was going on.

I thought you pointed me in the right direction with the 'not native' settings, because I did indeed have the luminance in the native setting for the calibration before. So I changed it to 120 cd/m2 and adjusted the brightness as indicated in the calibration procedure. Unfortunately, in the advanced analysis it still gives a value of 6900K or 7000K as if nothing has changed for the white point. The weird thing is that during calibration the values shown indicated that it iterated to (0.314,0.330) which indeed is close to 6500K, but the measurement of the advanced analysis says (0.305,0.328) which is indeed 6950K. Weird may also be that the brightness differed from 120 cd/m2 in the calibration to 132.7 cd/m2 in the advanced analysis (measured directly after the calibration, with the spyder hanging nearly in the same spot both times). Also the Spyderutility has not been touched all this time. I am using windows 7 (64 bits) and spyder4elite software version 4.5.4 with a Spyder Pro device (but I assume that the spyder pro and spyder elite devices are the same?). Does all this ring a bell for what is going wrong? Is there a bug in the calibration, a bug in the advanced analysis measurements, is the calibration in the windows color management not correct, am I doing something wrong or misunderstanding something? 

Kind regards,
Gerard 

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> During calibration one sets a desired color temperature (white point), say 6500K. Just as an experiment I put my monitor on 9300K through the OSD, looking very bluish. Performing an Advanced analysis - Brightness and contrast test indeed verifies that the color temperature is very high. With these settings I calibrated the monitor, assuming that the result would be a white much closer again to 6500K. However, even after calibration the color temperature is still very high similar as before. Am I misunderstanding something?
> 
> It is a bad idea to set the hardware controls to an extreme setting, just to see if the video corrections can play Superman and fix it. If you are targeting a whitepoint (not native whitepoint, which will leave it where it is) and a defined luminance (not native luminance) that is close to the max possible luminance, then you are asking for two mutually impossible things at once. There are other possible reasons your results would not be as expected, but I try to limit myself to dealing with questions about appropriate uses of the products, not intentional abuses.

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