Official JVC - 20LTD - RS640 (x990/x9900) - RS540 (X790/x7900) - Owners Thread - Page 453 - AVS Forum | Home Theater Discussions And Reviews
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post #13561 of 13608 Old 03-25-2020, 07:14 AM
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I’️ve tried the sdr2020 but I prefer a bit of a hdr effect. I just downloaded the two 500nits curves you posted. One says 500hc and 500sc. Do you know what the differences are? Also they come in a conf format can I use arve tool to load these? Sorry for all the questions this is all very new to me.
SDR2020 is HDR and nor SDR, in spite of the name. It should have plenty of “HDR Effect” if you keep the iris at the same position as HDR.

The 500 nits curves are experimental. hc and sc represent hard clip and soft clip respectively.
thanks for the info. I have sdr2020 set to low lamp maybe I should try in high lamp like hdr settings.
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post #13562 of 13608 Old 03-25-2020, 08:19 AM
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Maybe also because the sales figures of the new generation were not up to expectations ?
Who knows. Sony still is producing and selling 2018 model TV's, Z9F and 900F series. Why? beats me they are at a great price though.... Speaking of the 900F, Chad B feels the JVC 540U has a picture between a 900F and the best LED made to date, the 940E series. So in the end, the 540U is better then 90% of the TV's made when place in the correct environment.

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Power surge? Projector plugged directly into the wall? Are you using any surge suppression, uninterrupted power supply(ups), and/or automatic voltage regulation(avr)?
Well if you surge protect the unit, you have to do the HDMI as well otherwise you are not fully protected. Mine is not protected in either case.
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post #13563 of 13608 Old 03-25-2020, 11:39 AM
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If you’re referring to BBO in Arve’s tool, that serves a different function than black compensation. Adjusting BBO can lift the black level, whereas black compensation increases near black without touching black..
Hi Dominic ive always suffered from some black crushing and i would like to find tune this a little.. I understand that the 135-nits curves have black compensation but do the 60 nits and 85 nits curb have it as well..


Your 85 nits curb will be the closest to javs 1200nit v3 correct? But with some black compensation?
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post #13564 of 13608 Old 03-25-2020, 12:04 PM
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Hi Dominic ive always suffered from some black crushing and i would like to find tune this a little.. I understand that the 135-nits curves have black compensation but do the 60 nits and 85 nits curb have it as well..
The 135 nits curves have three versions with different levels of black compensation (0, 0.002, 0.005 nits). The 85 nits curves have one version only, 0.002 nits. I don't remember if the 60 nits curves have black compensation, but very few people need to use those.

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Your 85 nits curb will be the closest to javs 1200nit v3 correct? But with some black compensation?
Not really. Even for a nominal peak luminance of 85 nits, different people use different parameters for their curves.
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Last edited by Dominic Chan; 03-25-2020 at 01:53 PM.
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post #13565 of 13608 Old 03-25-2020, 01:15 PM
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Hi Dominic ive always suffered from some black crushing and i would like to find tune this a little.. I understand that the 135-nits curves have black compensation but do the 60 nits and 85 nits curb have it as well..
The 135 nits curves have three versions (0, 0.002, 0.005 nits). The 85 nits curves have one version only, 0.002 nits. I don't remember if the 60 nits curves have black compensation, but very few people need to use those.

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Your 85 nits curb will be the closest to javs 1200nit v3 correct? But with some black compensation?
Not really. Even for a nominal peak luminance of 85 nits, different people use different parameters for their curves.
I used the arve tool to load your 500nit Panasonic curve and it looks great. Does the black compensation still transfer onto the projector even though the arve tool does not support it?
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post #13566 of 13608 Old 03-25-2020, 01:34 PM
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I used the arve tool to load your 500nit Panasonic curve and it looks great. Does the black compensation still transfer onto the projector even though the arve tool does not support it?
No
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post #13567 of 13608 Old 03-25-2020, 01:53 PM
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I used the arve tool to load your 500nit Panasonic curve and it looks great. Does the black compensation still transfer onto the projector even though the arve tool does not support it?
No
really good to know thanks.
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post #13568 of 13608 Old 03-25-2020, 01:56 PM
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Hi Dominic ive always suffered from some black crushing and i would like to find tune this a little.. I understand that the 135-nits curves have black compensation but do the 60 nits and 85 nits curb have it as well..

Your 85 nits curb will be the closest to javs 1200nit v3 correct? But with some black compensation?
I have just added two curves that are copies of javs 85 nits curves, modified to add black compensation.

To evaluate them, put the original in modified curve in one gamma slot, and the corresponding black compensated version in the adjacent slot, then switch the gamma back and forth between the two. This does not cause a resync and lets you see the difference easily.

Last edited by Dominic Chan; 03-27-2020 at 04:34 AM.
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post #13569 of 13608 Old 03-25-2020, 02:24 PM
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post #13570 of 13608 Old 03-25-2020, 02:50 PM
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I have just added two curves that are copies of javs 85 nits curves, modified to add black compensation.
Oh crap wow.. thank u

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post #13571 of 13608 Old 03-25-2020, 03:47 PM
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This is my first hdr projector and I’m just wondering how it should hold up to say a oled tv for shadow detail? I think the hdr looks great as a whole but I find a small amount of shadow detail. Should it not crush any or is it just the nature of this projector.
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post #13572 of 13608 Old 03-25-2020, 08:25 PM
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This is my first hdr projector and I’m just wondering how it should hold up to say a oled tv for shadow detail? I think the hdr looks great as a whole but I find a small amount of shadow detail. Should it not crush any or is it just the nature of this projector.
It's more the nature of your calibration.
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post #13573 of 13608 Old 03-25-2020, 09:24 PM
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This is my first hdr projector and I’️m just wondering how it should hold up to say a oled tv for shadow detail? I think the hdr looks great as a whole but I find a small amount of shadow detail. Should it not crush any or is it just the nature of this projector.
It's more the nature of your calibration.
or the lack of calibration.... I finally took the time today to learn how to load curves on both programs. I wish I would have learned this weeks ago is was way easier then I thought.
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post #13574 of 13608 Old 03-25-2020, 09:30 PM
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or the lack of calibration.... I finally took the time today to learn how to load curves on both programs. I wish I would have learned this weeks ago is was way easier then I thought.
In particular what will control your amount of shadow detail is setting the correct brightness value and also your near black gamma curve.

Setting brightness is generally pretty easy as it's a single value and you can look at a simple near black bar test pattern which are pretty easy to find.

Calibrating your near black gamma is harder without a proper meter and some knowledge and understanding of the gamma editor in autocal or creating your own curve file to load.
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post #13575 of 13608 Old 03-26-2020, 05:20 AM
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or the lack of calibration.... I finally took the time today to learn how to load curves on both programs. I wish I would have learned this weeks ago is was way easier then I thought.
In particular what will control your amount of shadow detail is setting the correct brightness value and also your near black gamma curve.

Setting brightness is generally pretty easy as it's a single value and you can look at a simple near black bar test pattern which are pretty easy to find.

Calibrating your near black gamma is harder without a proper meter and some knowledge and understanding of the gamma editor in autocal or creating your own curve file to load.
Thanks for the info. I find the brightness controls for hdr raise the black floor if I’m looking at a test pattern. I started messing with bbo on the arves tool but I found that a bit tricky to get nailed down. I’ve heard of a black compensation in the Jvc auto cal but have not come across it yet. I’ll have to learn about auto cal More and see if I can change brightness from there. I may also pick up a spider5 from amazon in the future if needed. Can you recommend a pattern generator?

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post #13576 of 13608 Old 03-26-2020, 06:12 AM
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Official JVC - 20LTD - RS640 (x990/x9900) - RS540 (X790/x7900) - Owners Thread

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Thanks for the info. I find the brightness controls for hdr raise the black floor if I’m looking at a test pattern. I started messing with bbo on the arves tool but I found that a bit tricky to get nailed down. I’ve heard of a black compensation in the Jvc auto cal but have not come across it yet. I’ll have to learn about auto cal More and see if I can change brightness from there. I may also pick up a spider5 from amazon in the future if needed. Can you recommend a pattern generator?

That just means your black level is set correctly, before it starts raising the black floor.

Gamma on the other hand can’t affect black. So lowering the gamma value of the 1-5% range will increase the brightness of those near black shades without changing the black floor.

I use HCFR to generate all my patterns.

Occasionally I’ll use video file test patterns.


https://www.avsforum.com/forum/139-d...topics/2943380

https://github.com/testing-av/testing-video/releases

With those gamma curve files that you can upload to your projector with the Arve tool you can control all 1023 points, so you can define the gamma output level for every input level of every shade in the 10-bit signal.

Last edited by SirMaster; 03-26-2020 at 06:17 AM.
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post #13577 of 13608 Old 03-26-2020, 07:17 AM
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I’ve heard of a black compensation in the Jvc auto cal but have not come across it yet.
Black compensation is not a feature of JVC Autocal. What I said previously, was that some of my curves incorporate black compensation, and those can only be loaded using JVC Autocal.

EDIT: For clarification: The 12-point gamma control, also part of JVC Autocal, can be used to create and save curves of any shape, including black compensation. However, you will need to use calibration software (e.g., HCFR) to calculate and measure the desired gamma curve.

Last edited by Dominic Chan; 03-26-2020 at 07:31 AM.
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post #13578 of 13608 Old 03-26-2020, 07:23 AM
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Black compensation is not a feature of JVC Autocal. What I said previously, was that some of my curves incorporate black compensation, and those can only be loaded using JVC Autocal.
Oh ok thanks for the clarification. on another note I was testing black levels with my nose to the screen I saw something a bit strange. It’s like a really fine green mark on the screen when it’s all black. I took a picture right up close but it’s very blurry. The mark is super sharp so I’m guessing is a mark on the panels. It’s almost like it’s just letting a bit of light through. It’s very small though much smaller then a pixel and I can’t see it even looking when I’m at half my seated distance. Does anyone know what would cause this? or if it’s a issue?
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post #13579 of 13608 Old 03-26-2020, 08:28 AM
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I have just added two curves that are copies of javs 85 nits curves, modified to add black compensation.
Hi Dominic,

If you got a spare moment, can u educate me what's the difference between Arve curves and the curves we can install with Autocal?
I'm not clear of the difference.

I haven't started tinkering with custom gamma curves yet, I'm using your recommend settings for the default ST2084 curve.
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post #13580 of 13608 Old 03-26-2020, 09:10 AM
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Hi Dominic,

If you got a spare moment, can u educate me what's the difference between Arve curves and the curves we can install with Autocal?
I'm not clear of the difference.

I haven't started tinkering with custom gamma curves yet, I'm using your recommend settings for the default ST2084 curve.
Number of points in the curve. Autocal is 12 points and Arve is 1023 points as far as I understand.
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post #13581 of 13608 Old 03-26-2020, 09:32 AM
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I have just added two curves that are copies of javs 85 nits curves, modified to add black compensation.
Dominic after i load the curves with autocal if by any chance i still need to fix some of the black crushing i will just do that with arves tool correct?

I'm looking at the new 85 curve you uploaded it says last modified 12/22/18 shouldn't it have yesterdays date if you uploaded them yesterday?

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post #13582 of 13608 Old 03-26-2020, 09:42 AM
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Dominic after i load the curves with autocal if by any chance i still need to fix some of the black crushing i will just do that with arves tool correct?
You cannot modify jgd curves using the arve tool.

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I'm looking at the new 85 curve you uploaded it says last modified 12/22/18 shouldn't it have yesterdays date if you uploaded them yesterday?

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I just checked and they are dated 2020-03-25. You must be looking at the wrong curves.

Last edited by Dominic Chan; 03-28-2020 at 04:50 AM.
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post #13583 of 13608 Old 03-26-2020, 10:24 AM
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You cannot modify jgd curves using the arve tool.



I just checked and they are dated 2020-03-25. You may be looking at the wrong curves.

Damn i didnt even notice javs folder I was looking at the other folders.. Ok thanks
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post #13584 of 13608 Old 03-26-2020, 11:17 AM
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With those gamma curve files that you can upload to your projector with the Arve tool you can control all 1023 points, so you can define the gamma output level for every input level of every shade in the 10-bit signal.
I am not aware of how the 1% to 10% range can be adjusted with Arve’s tool. I wish it could.

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Quick update on my experience post-repair regarding the Dynamic Iris flickering/pumping issue on my RS-540.

After over a month of regular use the issue has still not come back, with one predictable exception.

I still can't believe how good the image looks, and how phenomenal the iris operation is. It's essentially invisible to me in normal viewing. In fact, I've had to glance up in the lens on occasion just to verify that the DI is in fact operating at all.

The one exception, which is previously documented, is that after getting a 4K Apple TV, my PJ would sometimes be shutdown in HDR mode and power on in SDR. As my HDR and SDR modes use different manual iris settings, this will cause the manual iris to lose it's position on the track, and the DI will go a little haywire in this instance. Cycling the manual iris all the way down and up will correct the issue (you'll hear it almost grind for a second as it's forced back into alignment). I fixed this by setting my universal remote to always flip the picture mode to natural before power off, so it always powers off and on in SDR. Since doing that I haven't seen any issues with the DI.

To recap, while in repair JVC replaced the manual iris to solve what I was perceiving to be a DI issue. The repair has (at least in the short term) completely resolved the intermittent pumping/flickering I was seeing with the DI. I'll be sure to post if the issue re-occurs in the future.
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post #13586 of 13608 Old 03-27-2020, 05:33 AM
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Quick questions:

Is the X7900 100% DCI-P3 with the filter in place?

What's the coverage without, 86% something?

Brightness loss with filter, in percent/lumens?

Cheers!
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post #13587 of 13608 Old 03-27-2020, 05:37 AM
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or the lack of calibration.... I finally took the time today to learn how to load curves on both programs. I wish I would have learned this weeks ago is was way easier then I thought.
With a proper calibration, the best way I could describe it would be, it’s like having a giant OLED screen. I’m utilizing masking, so I have a greater perceived contrast, but this projector absolutely has the best picture I’ve ever seen. That’s saying something considering I’ve owned many of the best plasma and led tv’s ever made. It’s so good, that I have no plans to upgrade my Sony XBR-75x940c anytime soon. In the days before I had a dedicated HT, I would have already moved on the the Z9F.

Again, a professional calibration is worth every penny. Your picture will be outstanding and you will never have to play with your settings again.
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post #13588 of 13608 Old 03-27-2020, 06:03 AM
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or the lack of calibration.... I finally took the time today to learn how to load curves on both programs. I wish I would have learned this weeks ago is was way easier then I thought.
With a proper calibration, the best way I could describe it would be, it’️s like having a giant OLED screen. I’️m utilizing masking, so I have a greater perceived contrast, but this projector absolutely has the best picture I’️ve ever seen. That’️s saying something considering I’️ve owned many of the best plasma and led tv’️s ever made. It’️s so good, that I have no plans to upgrade my Sony XBR-75x940c anytime soon. In the days before I had a dedicated HT, I would have already moved on the the Z9F.

Again, a professional calibration is worth every penny. Your picture will be outstanding and you will never have to play with your settings again.
I used to have the 75940c before I started with my first oled. This projector is amazing I still can’t believe the performance vs price.
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post #13589 of 13608 Old 03-27-2020, 06:05 AM
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I used to have the 75940c before I started with my first oled. This projector is amazing I still can’t believe the performance vs price.
Yes it is. I actually prefer the hdr on it vs my 940C.
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Originally Posted by Vitus4K View Post
Quick questions:

Is the X7900 100% DCI-P3 with the filter in place?

What's the coverage without, 86% something?

Brightness loss with filter, in percent/lumens?

Cheers!
99% to 100% with filter.
87% to 90% without filter.
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