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Author Topic: Lowest Black Level with LCD 3090wqxi?  (Read 3047 times)
walter.sk
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« on: February 05, 2011, 12:59:51 PM »
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Whether I use the Eye One Display ii or the Colormunki in conjunction with the SpectraViewII latest version, after I profile and calibrate my LCD 3090, the Black Level comes out between 0.40 and 0.45 cd/m2.  I don't remember ever seeing a lower reading.  Is this normal for this model monitor, or do people get lower readings?
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Czornyj
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« Reply #1 on: February 13, 2011, 06:05:22 PM »
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Try to turn "Auto Luminance" off - after 3600h of work my 3090WQXi got dimmer and went to 0,24cd/m^2 (with "Auto Luminance" option disabled)
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walter.sk
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« Reply #2 on: February 14, 2011, 09:45:07 AM »
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I will try that, as my monitor is due for calibration.  Am I correct in understanding that the Auto Luminance setting is simply to boost the brightness to compensate for aging of the monitor, and has nothing to do with evening out the luminance in the corners of the display?
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Czornyj
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« Reply #3 on: February 14, 2011, 10:36:16 AM »
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Yes, it's just keeping the luminance stability. You need to calibrate the display more often when the feature is off, but that's the only way to achieve lower bkpt.
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walter.sk
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« Reply #4 on: February 14, 2011, 11:14:14 AM »
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I did get a black Point of .26, which is better.  Concerning other settings, do you have either of these checked?

Average Low Luminance Measurements?

Extended Luminance Stability Time?
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Czornyj
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« Reply #5 on: February 14, 2011, 12:36:46 PM »
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"Average low luminance measurements" is a must. I'm also checking "Best grayscale color tracking", but don't use the "Extended luminance stabilisation time" - it's not working well with i1pro because of heat (I've described it in DISCUS topic: http://www.luminous-landscape.com/forum/index.php?topic=47154.20), so - before calibrating - you have to warm up the sensor on displays surface for a long time  to get consistent measurements.
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walter.sk
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« Reply #6 on: February 14, 2011, 01:45:46 PM »
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Thanks.  Do you think the heat negatively affects the ColorMunki?  I'm using it because my Eye-1 Display 2 is not one of the newer ones, and came with my HP Z3100-APS printer.  Having no means of comparing profiles, I just assumed that the Color Munki would be better for using with the Spectraview on the 3090.
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Czornyj
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« Reply #7 on: February 14, 2011, 02:22:13 PM »
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I'm not sure - I've tested CM a couple of times, but never too closely - generally it behaved similar to i1pro. The heat has only a subtle effect on measurements, so there's really no need to worry.
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walter.sk
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« Reply #8 on: February 15, 2011, 09:31:08 AM »
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Thanks.
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WillH
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« Reply #9 on: February 15, 2011, 12:23:53 PM »
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If you want to get the lowest black level possible (and hence highest contrast ratio), you must select "Maximize contrast ratio" as the Calibration Priority in the Preferences.
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Will Hollingworth
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walter.sk
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« Reply #10 on: February 15, 2011, 02:14:18 PM »
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If you want to get the lowest black level possible (and hence highest contrast ratio), you must select "Maximize contrast ratio" as the Calibration Priority in the Preferences.
Thanks, Will.  My goal is to get the lowest black level possible while still limiting the luminance to 120 cd/m2, which is my current target level.  Setting the highest contrast ratio would probably look great for videos but I use the monitor basically for photo editing, and I am more interested in using the monitor and my print-viewing box to be able better to softproof the file on the monitor and compare it to the final print on the print viewing box..
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WillH
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« Reply #11 on: February 16, 2011, 10:18:52 AM »
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If I understand your statement correctly, you are asking for two contradictory settings:
1. Lowest possible black level
2. Not wanting the highest possible contrast ratio.

If you fix your white luminance at 120cd/m2 then decreasing the black level will *increase* your contrast ratio.

Contrast ratio = white luminance / black luminance.
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Will Hollingworth
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walter.sk
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« Reply #12 on: February 16, 2011, 11:36:34 AM »
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I guess I didn't state my issue clearly.  I don't want the highest contrast ratio possible for the display.  What I do want is, for a given white luminance, say 120 cd/m2, I would like to get the deepest blacks within that parameter, regardless of the contrast ratio.  I am aware that, given the luminance of 120, the lower the black level the higher the contrast ratio, but it will not be the huge contrast ratio that would result from, say, the highest level of luminance the display is capable of.
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