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Fredrik
Joined: 03 Jul 2007
Posts: 49
Location: Stockholm
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| Posted: Thu Apr 02, 2009 9:38 am Post subject: Barco Data 808, Custom Calibration, Red Gain settings |
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Hi all,
Did a cailbration of the three eyed monster 
Quick question.
What does gain/bias actually do, does increase the ouput of the tube (e.g. the same as increasing contrast but for one specific tube) ?
Because when doing this and dialing in 100% (or as close to) on all three colors the gain on Red was in the 70-80 range.
Since the Barco 808 is not colorfiltered by default, is this the reason why it ends up at 70-80 ?
Would a filtered tube/lens correct this or is it normal.
It could also be a meter issue since it's a Spyder2.
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akajester
Joined: 09 Jul 2008
Posts: 934
Location: Wisconsin
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| Posted: Thu Apr 02, 2009 1:57 pm Post subject: Re: Barco Data 808, Custom Calibration, Red Gain settings |
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| Fredrik wrote: | Hi all,
Did a cailbration of the three eyed monster
Quick question.
What does gain/bias actually do, does increase the ouput of the tube (e.g. the same as increasing contrast but for one specific tube) ?
Because when doing this and dialing in 100% (or as close to) on all three colors the gain on Red was in the 70-80 range.
Since the Barco 808 is not colorfiltered by default, is this the reason why it ends up at 70-80 ?
Would a filtered tube/lens correct this or is it normal.
It could also be a meter issue since it's a Spyder2. |
I use the spyder 2 and I have a bg808 with HD145 color corrected lenses and at default 6500k settings the red was at 140%. I was able to back that down, following the excellent tutorial that Kal posted and it looks way better. I'll try to attach the graphs.
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Fredrik
Joined: 03 Jul 2007
Posts: 49
Location: Stockholm
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| Posted: Thu Apr 02, 2009 5:25 pm Post subject: |
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So where did your gain/bias setting end up being on RED ?
I'm just worried that I'm burning up the RED prematurely.
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akajester
Joined: 09 Jul 2008
Posts: 934
Location: Wisconsin
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| Posted: Thu Apr 02, 2009 6:13 pm Post subject: |
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| Fredrik wrote: | So where did your gain/bias setting end up being on RED ?
I'm just worried that I'm burning up the RED prematurely. |
Sorry, I didn't write them down. I can go through the correction process now in about 15 minutes, so I didn't bother. I can take a look tonight though if you're interested. It may not help you though, unless you have color corrected lenses too.
Also, I've heard the spyder2 can be innaccurate on blue, but haven't heard anything about red and green.
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Fredrik
Joined: 03 Jul 2007
Posts: 49
Location: Stockholm
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| Posted: Thu Apr 02, 2009 7:24 pm Post subject: |
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Would be great if you can let me know where the control settings are.
I'm not going to use it since it won't match my PJ setup as you say, just want to know if 70-80 is way out or not.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Apr 02, 2009 8:13 pm Post subject: |
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Yes gain is same thing that contrast, but only for one tube.
Color filtering doesn't affect to color temperature, only for primaries. So this is something else.
You can see what have been factory defaults for 6500K by pressing it from menu and then checking readings under custom. That is where adjustment needed to be with 6500K when projector was new.
There is many place to drift in projector. Boards and tubes have been used 10-15 years and some of those maybe chanced. Chancing one tube or one board can affect to color balance 10-20 click in menu. Also some adjustment like G2 affect to color adjustments, so trust your measurements and eye and don't worry about those high numbers in menu.
It sounds like your green tube have been burned in past (it's always first in 808) and now when it have been chanced to new one red and blue need to be driving bit harder.
And have you ever seen burned red tube?  Red need double hours to get some visible burn.
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Fredrik
Joined: 03 Jul 2007
Posts: 49
Location: Stockholm
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| Posted: Thu Apr 02, 2009 8:30 pm Post subject: |
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Thanks Ile for the information.
Can't say I've seen a burnt red but then I haven't seen alot of CRTs either 
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akajester
Joined: 09 Jul 2008
Posts: 934
Location: Wisconsin
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| Posted: Thu Apr 02, 2009 11:14 pm Post subject: |
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Gain:
Red: 28
Blue: 52
Cutoff:
Red: 59
Blue: 44
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Fredrik
Joined: 03 Jul 2007
Posts: 49
Location: Stockholm
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| Posted: Fri Apr 03, 2009 7:53 pm Post subject: |
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Thanks akajester,
Will see what I got, probably tonight.
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