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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

JVC DLA-RS35 for FILMOUT GRADING?

John Tissavary said:
Reproduction in low light is very accurate, but dependent on your probe. I would not recommend an x-rite i1pro as they are not accurate enought in the shadows for critical work in my experience. We use the Klein K-10, it's extremely accurate, and it's also the fastest probe I've ever used, allowing me to do a full cinespace cube lut in under 45min.


cheers,

JT
Click to expand...

Hello, JT

Could you help me on some questions I'm concerning about, as I'm designing my small grading suite.

1. When doing color grading, how much is the difference between JVC 950 and 990? Will the difference leading to a noticable different grading result?

2. What is the biggest screen size I can have with 990? As I would like to maintain the brightness around 14 ftl.

3. Do you have any recommendation on projection screen? Stewart Studiotek 130? Can I use the screen with gain 1.3?
 
filmark said:
Hello, JT

Could you help me on some questions I'm concerning about, as I'm designing my small grading suite.

1. When doing color grading, how much is the difference between JVC 950 and 990? Will the difference leading to a noticable different grading result?

2. What is the biggest screen size I can have with 990? As I would like to maintain the brightness around 14 ftl.

3. Do you have any recommendation on projection screen? Stewart Studiotek 130? Can I use the screen with gain 1.3?
Click to expand...

Not a full answer to your question but it may help..
As far as i know the JVC 990 has a contrast ratio of 70,000:1 vs the 950`s 50,000:1 .From what i`ve read there`s little appreciable difference in real use between the two ,allthough the reports were not from grading suite situations.Additionally unless you can really control the ambient light,especially in the immediate enviroment of the screen,that additional contrast may be lost. Bare in mind to that there`s a real price hike in the 990`s cost vs the 950.

I`ve seen the 550,950 and 990 back to back a few months ago and it`s really hard to tell the difference between the top two,and the 550 is a pretty fine as it stands believe me.If i was setting up now and i had a budget for a 990 i may consider a 550 and a lumagen scaler instead (and pay real attention to ambient light),it would allow far more accurate set up than the on board colour managment in the 950/990.Just thinkin` aloud..

There`s a review here.. http://www.avforums.com/reviews/JVC-...or-Review.html

Lumagen and JVC write up here.. http://www.cir-engineering.com/rs20.php
 
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First, if you don't have full control over the ambient light in the room, I wouldn't consider it much of a grading theater. Control over light in the room is one of the essential aspects to a useful grading suite.

You won't find a huge difference between the HD950 and the HD990 - but it's a bit more than just the higher contrast level. Basically the best parts from the batch are put into the 990's, including sharper lenses etc. Whether it's worth it depends on your total budget.

The norm is to use a screen with 1.0 gain. Higher gain screens have a smaller viewing angle. Not a huge difference with the Stewart 1.3 gain, but still something you want to avoid I think.

I'm installing an RS35 this fall and plan to project ca. 100" wide which should give me enough luminance.
 
We have the HD950 and I can tell you this, it is a great projector for the price range its in. We have a 147" Stewart screen SnowMatte 1.0 Gain screen and with the projector mounted at 16ft away we measured 12ftl full screen at high output on the projector. We don't take up the full screen though to measure 15ftl which is where we want to be when grading for optimal brightness. But when viewing, there is a pretty marginal difference between 12ftl and 15ftl so we will then zoom in to the full screen 147".
 
roryhinds said:
Hey Mike

How are you calibrating the projector?
Are you working in P3 or Rec709?
What are you grading with?
Click to expand...

Hey Rory,

We are calibrated for P3 and Rec709 Gamma 2.2. We have 2 user presets on both our Cinetal 24" 2000 for P3 Calibration and for Rec709. Just a flip of a switch and we are grading either or. Of course, we also use custom created 709 and P3 LUT's from Cinespace in Scratch for whichever we need to grade for, although the majority of the time we are going to REC709 output. Right now we use Scratch 5.1.
 
roryhinds said:
thanks Mike
So how are you calibrating your Projector?
Hubble and Cinespace?
Click to expand...

We hired a calibration technician from LA, Dave Abrams. If you are looking for someone I'll pm you his info. He calibrates every monitor we have including the projector, Cinetal, Dreamcolor and the Panasonic VT25 and then provides Cinespace LUT's based on the Monitor profiles for your grading LUT. Honestly, can't remember what probe he used but it was on a tripod and expensive :)
 
JVC announced a new series of projectors (X3, X5 and X7). These projectors have a filter tray to slide in a filter that pushes the colors beyond DCI spec. More light-output, too - which will probably be very useful when sliding the filter in (which will drop the lumens to get more saturated colors).

http://www.takesontech.com/?p=24188
 
I would be rather cautious of these PJ's if you are shooting for DCI/P3.

From my research it seems they are rather finicky in the way they create their color, and therefore dont play nice with the cheaper colorimeters (~$10,000 and less)

You are going to need a radiospectrometer, And the one from X-R ite is junk from what I heard, so is the 700 series from minolta. that leaves teh 800 series and above, which range in around $20,000....


That is, unless you happen to have a friendly neighboorhood Color calibration dude with all the right tools ;-)

I don't happen to have one locally, so soo much for that :-(
 
Barend Onneweer said:
JVC announced a new series of projectors (X3, X5 and X7). These projectors have a filter tray to slide in a filter that pushes the colors beyond DCI spec. More light-output, too - which will probably be very useful when sliding the filter in (which will drop the lumens to get more saturated colors).

http://www.takesontech.com/?p=24188
Click to expand...

The 3D and 100,000:1 contrast ratio sound pretty good.
 
I do a lot of projector/display calibration, and DLA technology does suffer from heat drift. If using these projectors make sure they are well temp controled.

Also, you need to accurately calibrate the setup by measuring the actual colour gamut, etc, before doing a profile to make a calibration LUT. A lot of the profile software systems (vs calibration) will attempt to make a calibration LUT regardless of if the display can actually meet the format gamut requirements - P3 especially as it is a wide gamut format.

Steve
 
So Steve, what's your recommendation for small grading suite with screen size around 150"？


Steve Shaw said:
I do a lot of projector/display calibration, and DLA technology does suffer from heat drift. If using these projectors make sure they are well temp controled.

Also, you need to accurately calibrate the setup by measuring the actual colour gamut, etc, before doing a profile to make a calibration LUT. A lot of the profile software systems (vs calibration) will attempt to make a calibration LUT regardless of if the display can actually meet the format gamut requirements - P3 especially as it is a wide gamut format.

Steve
Click to expand...
 
What's the perpurse for using a lumagen scaler?

Graham_C said:
Not a full answer to your question but it may help..
As far as i know the JVC 990 has a contrast ratio of 70,000:1 vs the 950`s 50,000:1 .From what i`ve read there`s little appreciable difference in real use between the two ,allthough the reports were not from grading suite situations.Additionally unless you can really control the ambient light,especially in the immediate enviroment of the screen,that additional contrast may be lost. Bare in mind to that there`s a real price hike in the 990`s cost vs the 950.

I`ve seen the 550,950 and 990 back to back a few months ago and it`s really hard to tell the difference between the top two,and the 550 is a pretty fine as it stands believe me.If i was setting up now and i had a budget for a 990 i may consider a 550 and a lumagen scaler instead (and pay real attention to ambient light),it would allow far more accurate set up than the on board colour managment in the 950/990.Just thinkin` aloud..

There`s a review here.. http://www.avforums.com/reviews/JVC-...or-Review.html

Lumagen and JVC write up here.. http://www.cir-engineering.com/rs20.php
Click to expand...
 
Filmark..did you click through to the thread here http://www.cir-engineering.com/rs20.php ? it`s well worth a read through. It should answer your question of why use a standalone Scaler when the unit allready ships with one on board.In essence,and please i`m no expert,it allows (amongst other things) a much finer and more linear calibration than the onboard colour managment system.For a more complete and fluent answer contact Craig who wrote the article.He`s a good fellow and will tell you all you might want to know!
 
I'm a fan of ProjectionDesign projectors - TI Dark chip. Cine-32 for example

I also always calibrate via an external LUT, either in the DI system, or via a BMD HDlink Pro, now that they have fixed the problems with the box.

Obviously, for profiling I use a Hubble, or similar, with LightSpace CMS, and get very accurate results.
 
NEW JVC MODELS!

NEW JVC MODELS!

The new models are shipping dla rs40/50/60

Does anyone have already any experience with those?
I can not find performers measurements of the new models on the net, if you stumbled upon one, or measured yourself, please share?

Thanks
 
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