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#270348 - 2017-11-30 22:48 Re: Projector light-spill [Re: Not'arf]
Registered: 2004-10-20
Posts: 1,347
GMT Offline
Working on the ultimate question
GMT Offline
Working on the ultimate question

Registered: 2004-10-20
Posts: 1,347
Loc: Cambridge, Cambs, UK
I hope you're not log chopping as well today Marcus - that's too much danger in one day!


Main: G68J, 218 HD621, 3*5200s (2 SE L&R),DSW, 2* Reviver, 3200s,SBT, PS4, Amazon TV Fire, Dune Base 3.0, Xbox, NUC (Roon server & Kodi)
Kitchen: 561M, M33s, M1500, SBT, Chromecast
Office: A330i, G41, Explorer2,Velodyne CT120
F80s, M60s
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#270350 - 2017-11-30 23:16 Re: Projector light-spill [Re: GMT]
Registered: 2004-01-04
Posts: 1,808
gIzzE Offline
Knows where his towel is
gIzzE Offline
Knows where his towel is

Registered: 2004-01-04
Posts: 1,808
Loc: Norwich, UK
The fact is you are using a 16:9 projector to shine light onto a 2.35:1 screen, you will always get overspill.

The only way around this is with an anamorphic lens.


Not sure why you are noticing it more now than before though.


Actually, why is your 'Bright level' on 4?
I would drop this to 0 at least and see what happens, this is setting absolute black, so on any positive you are making the absolute black a lighter grey.


No Darling, I've had it months!
Edited by gIzzE; 2017-11-30 23:25.
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#270354 - 2017-12-01 06:45 Re: Projector light-spill [Re: gIzzE]
Registered: 2011-08-22
Posts: 1,483
Not'arf Offline
Working on the ultimate question
Not'arf Offline
Working on the ultimate question

Registered: 2011-08-22
Posts: 1,483
Loc: Abruzzo, Italy
Tell me about it Tom!

Thanks for the tip re Bright Level. It's at 4 as that's the way it came; the place selling it said they'd set it all up so I've left well alone. I'm sure it needs setting up for each screen / location, so I'll fiddle with the Bright Level & some other settings & see where I get to. I can always go back if I mess it up.

It still doesn't explain why I sometimes get the (noticeable) light spill but more often don't. Bright Level may have somehow reset itself to that setting during a re-boot or some other gremlin-related episode.


Audio: MC200, G61R SL, HD621, DSP5500, 5000C, DSP3100. Subs: 2 x REL G2.
Video: JVC X70, Black Diamond Zero Edge screen 129"(2.35).

Meridian owner since 1998
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#270355 - 2017-12-01 06:47 Re: Projector light-spill [Re: gIzzE]
Registered: 2004-04-23
Posts: 2,382
Cliff. Offline
Senior Shouting Officer
Cliff. Offline
Senior Shouting Officer

Registered: 2004-04-23
Posts: 2,382
Loc: South Wiltshire, UK
I notice your lamp is in high mode. I thought that mode was used primarily for 3D to compensate for the reduced image brightness. Try normal lamp mode.

Edit:
Originally Posted By JVC Manual
Lamp Power

It is possible to change the brightness of the lamp.
(*) If continually used with "High", the lamp will become dark earlier.
(*) The more one lets the interior temperature of the device rise due to generation of heat, the less the level of tolerance against high temperatures.
(*) For about 60 seconds after the lamp is lit, the lamp cannot be switched off.
(*) This will be "High" when the "Picture Mode” is set to "3D". (for x70 and x90 models)
(*) This will be "High" when the "Picture Mode” is set to "3D", "Film" and "Cinema". (for x30 model)

Settings: Normal, High
Default= [Normal]

Normal: Normally this setting is chosen.(160W drive)
High: In a bright room, when the video is hard to see, this setting is chosen.(220W drive)


Main system - Sources (Kodi-HTPC, FireTV, Sat) into Trinnov Altitude32(+Roon), Amplitude8 amp & Vivid Audio (Giya G3, V1.5) speakers. Others: F80 + Raspberry Pi and other Pi systems.
Edited by Cliff.; 2017-12-01 07:49.
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#270357 - 2017-12-01 07:29 Re: Projector light-spill [Re: Cliff.]
Registered: 2011-08-22
Posts: 1,483
Not'arf Offline
Working on the ultimate question
Not'arf Offline
Working on the ultimate question

Registered: 2011-08-22
Posts: 1,483
Loc: Abruzzo, Italy
Cheers Cliff. We're away for a week now so I'll try that & the Bright Level when I get back.


Audio: MC200, G61R SL, HD621, DSP5500, 5000C, DSP3100. Subs: 2 x REL G2.
Video: JVC X70, Black Diamond Zero Edge screen 129"(2.35).

Meridian owner since 1998
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#270472 - 2017-12-04 17:11 Re: Projector light-spill [Re: Cliff.]
Registered: 2009-11-29
Posts: 1,137
Shaun Offline
Pan-dimensional being
Shaun Offline
Pan-dimensional being

Registered: 2009-11-29
Posts: 1,137
Loc: Isle of Man
I wasn't recommended to use High mode by Gordon no less of covergent AV

It all needs calibrating anyway!

Anamorphic isn't the way to go with Blu-ray unless you spend a tonne of cash!

Shaun


M owner since 207 CD player
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#270601 - 2017-12-09 20:40 Re: Projector light-spill [Re: Shaun]
Registered: 2011-08-22
Posts: 1,483
Not'arf Offline
Working on the ultimate question
Not'arf Offline
Working on the ultimate question

Registered: 2011-08-22
Posts: 1,483
Loc: Abruzzo, Italy
I've since fiddled with various settings & found...

1) Black level: I haven't yet downloaded / bought a calibration tool. That's my next step.
2) Lamp in High mode: I toggled back & forth between High & Normal several times & found it to be a mixed bag. We are currently watching Deadwood on Bluray & the scene in question was a well-lit forest scene. The change was as might be expected; High mode made it look like a sunny day with a lot of punch to the image, Normal looked (relatively) like a cloudy day but with similar contrast. We decided to watch the following episode in Normal & didn't feel as if we were missing out. When I popped in a 2.35 movie, the light-spill was barely reduced.
3) Bright Level: Reduced it from 4 to 0 but found the change to be very modest. Light-spill affected only modestly, if at all.

So I'm not much further forward. The confusing thing is the erratic nature of the 'spill. I get the fact that the PJ is pumping out a 16:9 image, but to have had years of no light-spill followed by months of light-spill, then reverting again is odd. I get that some reset / gremlins / inadvertent button press might have fiddled with some settings but I can't quite find a solution.

I'll get myself a proper calibration tool & report back.

Are Mulder & Scully still taking commissions?


Audio: MC200, G61R SL, HD621, DSP5500, 5000C, DSP3100. Subs: 2 x REL G2.
Video: JVC X70, Black Diamond Zero Edge screen 129"(2.35).

Meridian owner since 1998
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#270624 - 2017-12-10 21:36 Re: Projector light-spill [Re: Not'arf]
Registered: 2011-08-22
Posts: 1,483
Not'arf Offline
Working on the ultimate question
Not'arf Offline
Working on the ultimate question

Registered: 2011-08-22
Posts: 1,483
Loc: Abruzzo, Italy
I should perhaps mention, in case it means something to somebody, that the PJ is just over 6m from the screen. I think that might be why the thing was in High lamp mode.


Audio: MC200, G61R SL, HD621, DSP5500, 5000C, DSP3100. Subs: 2 x REL G2.
Video: JVC X70, Black Diamond Zero Edge screen 129"(2.35).

Meridian owner since 1998
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