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Arno P
Joined: 01 Jan 2007
Posts: 282
Location: The Netherlands
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| Posted: Fri Aug 15, 2008 8:47 pm Post subject: Marquee moome Gamma calibration |
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I played a bit with the moome gamma settings (potentiometer and remote) together with the trial version of "monitor test" that includes some nice "all in one" gamma test patterns for white and R G and B.
The maxium settings I could get with the moome card (viewing the patterns were:
W: 1,48
R: 1,35
G: 1,35
B: 1,58 (higher because of the internal blue gamma of the 9500lc ultra?)
Something must be wrong.....
I was aiming for the overall gamma of 2.2...BUT perhaps the program only is suited for non-crt curves?
Anyone who has done gamma measurements using the moome card setting or did the same exepriment with the monitor-test program ?
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"Obviously you're not a golfer"
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winduptoy
Joined: 25 Nov 2006
Posts: 187
Location: Lunenburg, Nova Scotia
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| Posted: Sat Aug 16, 2008 12:16 pm Post subject: |
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I just got my card this week. Last night I was doing a tuneup and had an overall gamma of 1.74. Will explore more tonight. BTW, I'm using the new pluge targets on DVE-HD Basics blu-ray disc.
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winduptoy
Joined: 25 Nov 2006
Posts: 187
Location: Lunenburg, Nova Scotia
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| Posted: Sat Aug 16, 2008 12:38 pm Post subject: |
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Here's a couple of screenshots from last night's session...
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winduptoy
Joined: 25 Nov 2006
Posts: 187
Location: Lunenburg, Nova Scotia
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| Posted: Sat Aug 16, 2008 12:43 pm Post subject: |
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Oop! Hit wrong button...Sorry.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Sat Aug 16, 2008 2:30 pm Post subject: Re: Marquee moome Gamma calibration |
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| Arno P wrote: | The maxium settings I could get with the moome card (viewing the patterns were:
W: 1,48
R: 1,35
G: 1,35
B: 1,58 (higher because of the internal blue gamma of the 9500lc ultra?)
Something must be wrong..... |
Yes -- it's your understanding of gamma. 
Darker = higher gamma number, lighter = lower gamma number. See e.g. this post.
The "gamma booster" boxes boost the low-end light levels, making the shadow detail brighter. This produces a LOWER gamma number. Assuming you're using HCFR, display the Luminance graph. With gammas in the 1.35 range, you'll see that your luminance numbers are way ABOVE the 2.2 target, like the 1.5 example in the above post. You're boosting too much. Turn down the Moome boost and measure again, and you'll get higher gamma numbers.
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Arno P
Joined: 01 Jan 2007
Posts: 282
Location: The Netherlands
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| Posted: Sat Aug 16, 2008 3:11 pm Post subject: Re: Marquee moome Gamma calibration |
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| garyfritz wrote: | | Arno P wrote: | The maxium settings I could get with the moome card (viewing the patterns were:
W: 1,48
R: 1,35
G: 1,35
B: 1,58 (higher because of the internal blue gamma of the 9500lc ultra?)
Something must be wrong..... |
Yes -- it's your understanding of gamma.
Darker = higher gamma number, lighter = lower gamma number. See e.g. this post.
The "gamma booster" boxes boost the low-end light levels, making the shadow detail brighter. This produces a LOWER gamma number. Assuming you're using HCFR, display the Luminance graph. With gammas in the 1.35 range, you'll see that your luminance numbers are way ABOVE the 2.2 target, like the 1.5 example in the above post. You're boosting too much. Turn down the Moome boost and measure again, and you'll get higher gamma numbers. |
I do understand gamma (and the boost for the lower part of the curve taht the moome does)...BUT....turning the moome to the extremes on both sides of the scale I expected to reach this 2.2....(since the eye is seeing the effect of gamma in total) Right?...or was I too positive thinking I could do without a measurement by simply using a test pattern for gamma?
It's measurement time again then... 
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Sat Aug 16, 2008 5:01 pm Post subject: |
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Try turning the adjustment screw to midrange and measure again. I would expect that to produce a higher gamma number.
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Arno P
Joined: 01 Jan 2007
Posts: 282
Location: The Netherlands
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| Posted: Sat Aug 16, 2008 9:05 pm Post subject: |
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| garyfritz wrote: | | Try turning the adjustment screw to midrange and measure again. I would expect that to produce a higher gamma number. |
Hm, didnt try that before..thx
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Sun Aug 17, 2008 4:14 pm Post subject: |
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I think what's happening is that you had it boosted too high, and that gave you the low gamma number. If you put it in the middle of the adjustment range, that should ensure you're somewhere near a reasonable gamma. Measuring it with the median setting will give you an idea if you should boost it (to lower the gamma) or drop it (to raise the gamma) from there.
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