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Satanier
Joined: 25 Aug 2008
Posts: 185
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| Posted: Sun Sep 14, 2008 10:41 pm Post subject: Re: NEC XG Brightness Issue |
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| Elaine Benes wrote: | | Satanier wrote: |
I've read that turning up brightness or contrast shortens tube life, so if this is equivalent wouldn't that be bad?
What sort of range does a low level gamma boost device work with? I feel like the whole image overall could use a boost, although the dark areas are of course the worst. |
The question is, though, so what if it DOES shorten tube life ???
Simply USING the projector shortens tube life, but you wouldn't consider NOT using it, right ??
If you have an image you HATE watching, then WHO CARES how long your tubes last ?
Why bother worrying about stuff that you have little to no control over. Pretty much, if you want a pleasant image, you have to make your projector put out the light. If that means pushing the brightness, by ANY METHOD, then do it.
There is a finite amount of light ANY projection tube can put out without lighting up the parts of the image that are supposed to be black. Period. You can adjust your "G2" which I would personally avoid like the plague, if you like, but in the end, only so much light comes out till the black areas start to turn grey. Pretty much the ONLY way to avoid this is to employ SOME KIND of low level gamma boost. Some people achieve this by using a custom gamma curve in Nvidia control panel, some use a device between their sources and projectors which applies a uniform low level gamma boost to all sources, some people have expensive scalers that allow customized low level gamma boost in such a way as to preserve ruler flat gray scale as well. There are ANY NUMBER OF WAYS to achieve the same result. Low level gamma boost devices generally only affect the lowest range of brightness, from just above black to dark gray. Electronic gamma controls, like the Nvidia gamma curve, can be used to affect the entire gamma range if you so prefer, but MOST people ONLY boost the very low brightness part of the curve.
You've already stated you got a satisfactory image by adjusting your computers graphics card color controls, SO USE THAT.
As I've already stated, the "Brightness" control has little effect on the overall life of your tubes, as it controls the BLACK level. It doesn't matter WHAT brightness control you use, be it the projectors or sources, you're still always adjusting the same thing, the BLACK level.
What you can be concerned about, if you must be concerned about something, is your CONTRAST levels... If you run your CONTRAST levels excessively high, you will cause abnormally fast tube wear, but note I say abnormally fast. What that implies is that the tubes WEAR NORMALLY. And by "abnormally fast" I mean you might get 6000 hours of satisfying use instead of 8000 hours, NOT like you'd only get 4 hours of satisfying use instead of 10,000. The effects of higher than normal contrast are *generally* not profound.
Simply using your projector in a normal fashion will cause the tubes to wear/degrade, it is the nature of the display technology. The phosphor coating has a finite amount of light that can be emitted in relation to the amount of electrons that bombard it. The difference in useful tube life is affected by ABNORMALLY high contrast settings a lot more than slightly higher brightness settings.
You will know if your contrast is set too high if you have poor focus. You will also know if your contrast is set too high if you have no distinction in varying white scenes. Use the THX test pattern to check this, it is one of the best for this. It is found on many DVD's with the THX logo. |
My contrast is default 75% on my projector, and I haven't adjusted it on the control panel on my PC so I should be ok. I just wanted to make sure changing the brightness wouldn't burn my tubes in 500 hours or something.
I see what you mean about the brightness thing, I was thinking to myself that I would rather have it last not as long and be enjoyable to watch, than have it last longer and be too dark to enjoy during that time.
As for focus, I can't get the left and right sides of my green to focus, but other than that all other focus looks fine. The picture is quite sharp. The green tube issue is on the tube face, I've looked through the lens and the left and right sides are not focused right. I'll also look at a THX test pattern and make sure I have distinction in shades of white.
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Satanier
Joined: 25 Aug 2008
Posts: 185
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| Posted: Tue Sep 16, 2008 3:55 am Post subject: |
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Update to close this case...
Brightness issue FIXED using custom nvidia gamma curve made by forum member Ile!!!!
All darker scenes now have full shadow detail with pure blacks preserved, all other scenes have more pop now, looks great!!!
I was actually able to reduce my projectors brightness from 60 to 50, and my contrast from 75 to 70 and it looks better than
ever!
Still going to save up for box 1040 however, because I'm sure it does it even better and gives me component input.
That's about it.
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