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ilias
Joined: 20 Apr 2007
Posts: 116
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| Posted: Fri Nov 07, 2008 8:30 am Post subject: What About Brightnes? |
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I have a Dalite VIDEO SPECTRA screen 120'' with gain 1,5 and my SONY G70 in the menu screen in position 2, for mat screen, but the THX OPTIMAZER disk show my to put the brightness in 65-68, and contrast 75, the PJ have 9000 hours, is that correct? leaved there? is a problem?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Fri Nov 07, 2008 4:43 pm Post subject: Re: What About Brightnes? |
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| ilias wrote: | | I have a Dalite VIDEO SPECTRA screen 120'' with gain 1,5 and my SONY G70 in the menu screen in position 2, for mat screen, but the THX OPTIMAZER disk show my to put the brightness in 65-68, and contrast 75, the PJ have 9000 hours, is that correct? leaved there? is a problem? |
if I remeber correctly the default contrast on a G70 is 80, so you should be ok at 75. It also depends though on the Gain settings fo each tube, on a G70 the tubes are driven pretty hard at default settings.
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Fri Nov 07, 2008 6:04 pm Post subject: Re: What About Brightnes? |
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| ilias wrote: | | I have a Dalite VIDEO SPECTRA screen 120'' with gain 1,5 and my SONY G70 in the menu screen in position 2, for mat screen, but the THX OPTIMAZER disk show my to put the brightness in 65-68, and contrast 75, the PJ have 9000 hours, is that correct? leaved there? is a problem? |
It is not that odd that you need brightness at that level to not crush black. The issue with CRTs is that there is a phosphor output curve with relation to excitement. If you set brightness low enough that "black" is really black, then something like 3 or 5 IRE will not have enough light output to be visible.
Generally speaking, you can modify the shape of the low end of the gamma curve which will allow you to lower the brightness a couple of clicks. This is the "gamma mods" talked about around here. Get your PJ set up as best as you can, then bump the brightness down to about 3-5 points and watch (you will be crushing the lows). But, if you find that black level more satisfying, use one of the techniques to reshape the gamma curve. You'll get the blacks of the 3-5 point lower gamma setting and the shadow detail of your current calibrated setting.
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ilias
Joined: 20 Apr 2007
Posts: 116
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| Posted: Fri Nov 07, 2008 9:06 pm Post subject: |
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Thank you!
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ilias
Joined: 20 Apr 2007
Posts: 116
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| Posted: Sat Nov 08, 2008 12:46 pm Post subject: |
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I trιed 2 setup disks, one HOME THEATER SETUP, and the THX OPTIMAZER inside the STAR WARS I, the first is fine numbers in brightnes and sharpnes 60/70, the second gives me 75/85 wy that?
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ilias
Joined: 20 Apr 2007
Posts: 116
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| Posted: Sat Nov 08, 2008 12:47 pm Post subject: |
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| ilias wrote: | | I trιed 2 setup disks, one HOME THEATER SETUP, and the THX OPTIMAZER inside the STAR WARS I, the first is fine numbers in brightnes and sharpnes 60/70, the second gives me 75/85 wy that? what i follow? |
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Sat Nov 08, 2008 4:26 pm Post subject: Re: What About Brightnes? |
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| ilias wrote: | | I have a Dalite VIDEO SPECTRA screen 120'' with gain 1,5 and my SONY G70 in the menu screen in position 2, for mat screen, but the THX OPTIMAZER disk show my to put the brightness in 65-68, and contrast 75, the PJ have 9000 hours, is that correct? leaved there? is a problem? |
Yes that could very well be correct for you PJ.
The brightness seems a little high compared to my setup, but it depends a host of factors including the BIAS setting for each tube, age etc.
Do you have access to a color meter? With a higher brightness setting you may be hurting your gamma and contrast ratio.
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ilias
Joined: 20 Apr 2007
Posts: 116
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| Posted: Mon Nov 10, 2008 2:42 pm Post subject: |
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No dont't have access to a color meter!
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