Recommended Brightness cd/m2? - AVS Forum
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post #1 of 6 Old 01-22-2013, 01:57 PM - Thread Starter
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Hi,
I have been reeding about is the brightness at 100 IRE (100% White) have any rules for standard and I can't find it.

So I thought that we can discuss it.


I got a plasma LG 60"

For ISF-night I got about 80 cd/m2 and I can't go higher because then the greyscale 'll totally go crazy, almost that I shod go lower but that I can't do because then the plasma 'll bee to dark, I still have color shifting in the greyramp at 70 - 80 IRE (White)
But for ISF-day I have been compromising and put it on 110 cd/m2 and tryd to fix the greyscale as good as I can.

I only use ISF-Night in a dark room.


Is this good or shod I lower the contrast even more to get better greyscale?
Is it any rule for standard about brightness?
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post #2 of 6 Old 01-22-2013, 03:08 PM
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What patterns are you using to measure grayscale and brightness? You should be using windows or maybe APL patterns with a plasma. What issues are caused by setting the contrast higher that can't be fixed with the W/B controls? Both 80 and 110 cdm2 are fairly low for their respective applications/room conditions IMO... I would think that you should be able to go higher without much trouble, but I don't own that model. I usually like around 120cdm2 for a dark room, but everyone's different I suppose.

I think the general rule is to not so much target a specific brightness, but to set the contrast to a comfortable brightness level for your room conditions, as long as there aren't any negative effects, such as white clipping or color shift in white levels below ~240-242. That's what I do anyway.
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post #3 of 6 Old 01-22-2013, 03:32 PM - Thread Starter
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Quote:
Originally Posted by rahzel View Post

What patterns are you using to measure grayscale and brightness? You should be using windows or maybe APL patterns with a plasma. What issues are caused by setting the contrast higher that can't be fixed with the W/B controls? Both 80 and 110 cdm2 are fairly low for their respective applications/room conditions IMO... I would think that you should be able to go higher without much trouble, but I don't own that model. I usually like around 120cdm2 for a dark room, but everyone's different I suppose.

I think the general rule is to not so much target a specific brightness, but to set the contrast to a comfortable brightness level for your room conditions, as long as there aren't any negative effects, such as white clipping or color shift in white levels below ~240-242. That's what I do anyway.

The lg 60pa550 cant get any brighter.
I use Window, My greyacale is flat now and rgb is fine and gamma st 2.2 byt still i have color swifting in My Greyscale.
And 80 cd/m2.
Then i have contrast at 70 click.
I dont clipp anything.

When i higher The contrast to 85 click i got 109 cd/m2.
But My greyscale go crazy if i use it from 70-100.
Dives like an sub.


Sorry for The spelling i use My iPhone with swedish auto correction.
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post #4 of 6 Old 01-22-2013, 03:46 PM
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how are you measuring, with the meter in contact mode, or set at a distance from the screen? What meter and software are you using? What is your source for the patterns, DVD, BluRay, HTPC etc?
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post #5 of 6 Old 01-22-2013, 04:00 PM - Thread Starter
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Contact mode
1ipro and c6
Calman V5
Avchd709 and dve bd

Bluray player lg is The source.
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post #6 of 6 Old 01-22-2013, 04:13 PM
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Try the GCD 10% window or 10% APL patterns instead. IIRC, DVE's windows are ~18% and AVS HD 709's windows are ~14%. The DVE windows especially are probably engaging the ABL at higher stimulus levels causing the gamma to dip.

Don't most LG displays have 10/20pt white balance controls? If you use the 10% patterns, the dip at higher stimulus levels probably won't be as sharp compared to the DVE windows (or not there at all). If there's a small dip, use the white balance controls to flatten the gamma by grouping RGB together. Raising RGB will lower the gamma, lowering RGB will increase the gamma.
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