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stridsvognen
Guest
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| Posted: Sat Jun 01, 2013 2:08 pm Post subject: |
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What is the on off contrast when Black measure 0.000fl and White is 36.000fl
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Sat Jun 01, 2013 4:03 pm Post subject: |
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| stridsvognen wrote: | | What is the on off contrast when Black measure 0.000fl and White is 36.000fl |
Spanky just covered that when he related that Darin measured a G70 at 500k:1 to 700k:1 on/off with gamma mods. There's now you're doing that without losing a few IRE at the bottom end, though. I could believe 100k or 200k:1, at 700k:1, you're going to lose at least a little bottom end.
| stridsvognen wrote: | | Im not sure what modes exist in yours, but if you measure them all im sure you will se they are corected in the projector, so i was curious if there is a native mode where it buypass all the internal corection in the projector. |
I'm not sure there is, and I'm not sure why anybody would care. It would be like measuring CRT on/off without gamma correction. Nobody in their right mind would use it that way anymore, and it would severely handicap the CRT's ability to offer excellent on/off while still reproducing most of the low-end detail... So, why measure it? Doesn't it make sense to measure the projector in its best-performing mode since that's the way people would use it?
| stridsvognen wrote: | Most CRT VS digital threads is based on opinions and 2nd hand information. I thought some hardcore facts based on your measurement would get much more respect.  |
Sort of. The problem then is you have amateurs like myself, who don't know that much about calibration, with low-end gear, questionable technique, and a vast variability of screens and rooms. Just how useful is this information beyond, "This is what ecrabb measured his RS45 ANSI in his room, with his equipment"?
Personally, I'd much rather take the word of the long-time experts like Craig, William Phelps, Darin, and others. The point is, this has all been done before several years ago - by experts - when digitals finally started getting good and CRT started waning in popularity. So, you're sort of saying, "I'm not really interested in what the experts have to say because it's all second-hand info; I'm more interested in what my amateur peers with their amateur equipment have to say on the matter.
I'll be happy to do a recal on my machine. I've been wanting to do it, I've got about 500 hours on my lamp now, and I have an Oppo in the signal path, so I'll try it and see what I come up with with my old i1 Display 2. Not sure what it'll be worth, but I'll give it a try.
SC
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stridsvognen
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| Posted: Sat Jun 01, 2013 5:01 pm Post subject: |
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Those nr i mentione above for on off contrast is on a 8500 AC, with radiance gamma corection, and i have visible 1% IRE window, im not sure what you mean when you say i Loose low level details when using the gamma corection.
I have more and better low level details on CRT than on JVC with almost identical calibration Measurements, its easier to get a linear curve out of Black with my marquee, and almost impossible with the JVC.
What i try to say about the native mode on the JVC is that i actualy think most digital projectors needs more signal corection to behave linear than a CRT needs. From what i understan its actualy one of the strong sides of CRT, there is mostly just the blue bump on the gamma curve that is out of order.
I have the impretion that all JVC projectors, also older models could have same linear response as the last new model, if JVC woul make the software upgrade/ support for the older models, i doubt its the panels response that have changed much, but i would be happy to find out if they actualy had improvet the native behavior, insted of manipulating the signal.
We all know that no marketing department these days tells the truth.. Or at least they manipulate the truth.. and put worthless specs that none of us can understand.
So your measurements would indeed be much more worth to me than any factory lab. specs.
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