Different RGB and luminance readings when measurements are performed while in service - AVS Forum
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post #1 of 4 Old 11-11-2009, 05:58 AM - Thread Starter
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I noticed when calibrating my Panasonic, I receive different RGB and luminance readings when measurements are performed while in service mode, as opposed to outside service mode.

Has anyone else come across this, and what calibration adjustments would you make to account for the differences?

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post #2 of 4 Old 11-11-2009, 06:38 AM
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I've found that anytime there is a menu on the screen while taking measurements, there is a variation in readings. Be it RP or Flat Panel displays.

If you account for the deviation between the SM vs normal, then offset the values accordingly while you are in the SM.
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post #3 of 4 Old 11-11-2009, 07:19 AM
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Yes, it's entirely normal. On Panasonic plasmas, the difference between gamma in the SM vs. out of it is very dramatic in some modes, and very slight on other modes like THX.
You can either record offsets like Lee said, or you can get close in the SM and then fine tune by checking the results outside the SM.
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post #4 of 4 Old 11-11-2009, 08:51 AM - Thread Starter
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Quote:
Originally Posted by Chad B View Post

Yes, it's entirely normal. On Panasonic plasmas, the difference between gamma in the SM vs. out of it is very dramatic in some modes, and very slight on other modes like THX.
You can either record offsets like Lee said, or you can get close in the SM and then fine tune by checking the results outside the SM.

Thanks Lee and Chad. I thought I was going crazy.

Yes, I found the luminance curve and gamma readings much better in SM. Outside SM the luminance curve has an upward belly at 50 - 70 IRE, and the gamma is lower (under 1.75). In the SM the luminance curve is on the money, and the gamma is more linear, and around 2.

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