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'Greyscale & Colour Calibration for Dummies' Q/A thread
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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Wed Sep 17, 2008 2:05 pm    Post subject:

bubsnews wrote:
Sorry about that 'slip' Kal. I know that you wrote it, we've corresponded before.

As far as the question regarding adjustments of red and cyan in the guide...

Step 8.2, Adjusting the Color Control
Guide says check 'Y' value with "100% Gray window", then skip to "100% Red window" and adjust using the color control so that 'Y' is 21% of 100% Gray window 'Y'.

Step 8.3, Adjusting the tint control
Guide says check 'Y' value with "100% Gray window", then skip to "100% Cyan window" and adjust using the tint control so that Cyan 'x' and 'y' values equal 0.225 and 0.329 respectively.

If I'm using HDMI and my color and tint controls are greyed out, how would I adjust red and cyan? All the other primaries and secondaries have x and y coordinates so I know where they are supposed to be. I see now under step 8.3, that there are x and y coordinates for cyan. Still, I can't see how to adjust red if my color control is unavailable.

You can't. You have to skip the colour and tint adjustments and use the CMS controls of the display. Setting colour and tint the best possible is only the first step and doesn't really help much, it just ensures that we're not trying to compensate for really messed up values with the CMS. You'll never get anything close to accurate by only using colour & tint. We're just trying to make sure they're not way off. As you've seen the controls are disabled when a better connection is used which is good thing as then we KNOW that the colour and tint controls aren't messing anything up as they're not changing the signal at all.

In my guide I state:

Quote:
STEP 8.2: Adjusting the colour control
.
.
.
On some displays the colour control will not have any effect when using any input other than the low end 480i composite or S-video inputs. If you are using the RGB, component, DVI, or HDMI input on display and find that for your display the colour control does nothing or is not adjustable, skip the step. There is nothing you need to do.


STEP 8.3: Adjusting the tint control
.
.
.
On some displays the tint control will not have any effect when using any input other than the low end 480i composite or S-video inputs. If you are using the RGB, component, DVI, or HDMI input on display and find that for your display the tint control does nothing or is not adjustable, skip the step. There is nothing you need to do.


(I adjusted the wording slightly to make it clearer).

Quote:
Again, my apologies for typing Curt instead of Kal TWICE no less, Kal. Thank you for your assistance. Your guide rocks and so do you for putting up with all my questions. I can't thank you enough for how much improvement I see in my displays due solely to your efforts with this guide.

No problems! Wink Glad the guide helped you out!

Kal

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karmat63



Joined: 19 Dec 2007
Posts: 157
Location: Italy

Posted: Mon Oct 13, 2008 1:11 pm    Post subject: "G2 pots" on Marquee

Before all, congratulations and many thanks for your work, Kal.

Maybe a simple question: you wrote, it would be nice, before calibration, to perform a regulation of "G2 pots" on tubes, so that each tube could lit at same moment. I tested mines and they're away from right, being the green the first to go on and the red the last. I don't remember the Marquees have this kind of regulation on tubes and don't find anything like it on manuals. It looks like you con only regulate G2 on color temperature menu. But doing so, you will interact with low lights grayscale calibration. Is it a sort of iterative calibration or... where am I wrong?

Thanks in advance.
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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Mon Oct 13, 2008 3:18 pm    Post subject:

A Marquee's G2 is not the G2 pots that I talk about Marquee's use the term G2 to denote one of the two controls you adjust to do greyscale. I'm not sure if Marquees even have a way of adjusting the G2 voltage bias on the tubes. (I'm not a Marquee guy).

Kal

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djphatic



Joined: 16 Oct 2008
Posts: 6


Posted: Thu Oct 16, 2008 9:44 am    Post subject:

A quick question:

What is the recommended source device for calibrating an HDTV? I have a PS3, 360, HTPC.

I think the PS3 maybe the best solution as the graphics card on the HTPC adds additional color settings and issues. If i use the PS3, what would be the recommended settings for the PS3 relating to RGB, Super White etc.

Also is DVE HD essentially or could I use the free test patterns from AVS as an alternative.

Any help is much appreciated. Thanks
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kal
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Joined: 06 Mar 2006
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Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Thu Oct 16, 2008 2:03 pm    Post subject:

djphatic wrote:
A quick question:

What is the recommended source device for calibrating an HDTV? I have a PS3, 360, HTPC.

I think the PS3 maybe the best solution as the graphics card on the HTPC adds additional color settings and issues. If i use the PS3, what would be the recommended settings for the PS3 relating to RGB, Super White etc.

Also is DVE HD essentially or could I use the free test patterns from AVS as an alternative.

Any help is much appreciated. Thanks


Use whichever source you want calibrated to be the most correct, most likely Blu-ray out of the PS3 (that's what I do as movies are the most important for me). The others will be very close as long as you don't use any built-in settings (especially the HTPC).

Not sure of the PS3 settings as I ste them up quite some time ago - also depends on if you're display can handle RGB vs YCbCr and can pass the full 0-255 range or only 16-235. Sony uses silly names for standards like blacker-than-black and whiter-than-white so I can't remember what their terms mean.

Free test patterns work fine. See section 8.1 in my guide for the one from AVS that I recommend.

Kal

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djphatic



Joined: 16 Oct 2008
Posts: 6


Posted: Sun Oct 19, 2008 9:12 pm    Post subject:

kal wrote:
Not sure of the PS3 settings as I ste them up quite some time ago - also depends on if you're display can handle RGB vs YCbCr and can pass the full 0-255 range or only 16-235. Sony uses silly names for standards like blacker-than-black and whiter-than-white so I can't remember what their terms mean.

I have set BD/DVD Video Output Format to Y Pb/Cb Pr/Cr, RGB full range range to Full and Y Pb/Cb Pr/Cr Super-white to off.

Should this be ok, or should i set video output format to RGB?
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ace4



Joined: 25 Nov 2008
Posts: 2


Posted: Tue Nov 25, 2008 11:50 pm    Post subject:

This may be a stupid question, but I'm not sure how I'm supposed to attach the eye-one to my plasma.

Do I need to use a tripod or does it directly touch the screen? Thank you.
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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Wed Nov 26, 2008 4:31 am    Post subject:

ace4 wrote:
This may be a stupid question, but I'm not sure how I'm supposed to attach the eye-one to my plasma.

Do I need to use a tripod or does it directly touch the screen? Thank you.


Stick it directly on (carefully) or hang it over the front so that it sits flush to it.

From the guide:

"If you're using a direct-view display (digital or CRT) including rear projection TVs, you've got it easy! Simply hang the sensor flat on the display as shown below (there's a counterweight on the cable to keep it in place). Make sure it's nice and flat against the display surface. If you can't get it to lie flat against the display surface, you can gently hold it in place with your hand. If you're using a Plasma display, make sure to let the sensor warm up on the display for a good 30 minutes as the temperature change will affect the readings. If you're using the Eye-One sensor I would recommend re-doing the sensor calibration again after the 30 minute warmup. "


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hariskar



Joined: 01 Dec 2008
Posts: 18
Location: Greece/Kavala

Posted: Tue Dec 02, 2008 3:29 pm    Post subject:

Can I use Eye-one pro in this guide? Is this sensor listed in HCFR Colormeter's drop down menu in setup?
Thank you!
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kal
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Posted: Tue Dec 02, 2008 5:44 pm    Post subject:

hariskar wrote:
Can I use Eye-one pro in this guide? Is this sensor listed in HCFR Colormeter's drop down menu in setup?
Thank you!


Yes you can. Have you read the guide yet? The guide talks about the Eye-One Pro.

Kal

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hariskar



Joined: 01 Dec 2008
Posts: 18
Location: Greece/Kavala

Posted: Tue Dec 02, 2008 7:09 pm    Post subject:

kal wrote:
hariskar wrote:
Can I use Eye-one pro in this guide? Is this sensor listed in HCFR Colormeter's drop down menu in setup?
Thank you!


Yes you can. Have you read the guide yet? The guide talks about the Eye-One Pro.

Kal


Yes I have, I saw it is in this guide, but I can't find it listed in official ColorHCFR page: http://www.homecinema-fr.com/colorimetre/index_en.php
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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Tue Dec 02, 2008 9:43 pm    Post subject:

hariskar wrote:
Yes I have, I saw it is in this guide, but I can't find it listed in official ColorHCFR page: http://www.homecinema-fr.com/colorimetre/index_en.php

It's an option in the HCFR software menus and also available in the help pages of the software. I don't see any mention of what meters are or are not supported on the page you referenced.

KAl

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hariskar



Joined: 01 Dec 2008
Posts: 18
Location: Greece/Kavala

Posted: Wed Dec 03, 2008 5:28 am    Post subject:

kal wrote:
hariskar wrote:
Yes I have, I saw it is in this guide, but I can't find it listed in official ColorHCFR page: http://www.homecinema-fr.com/colorimetre/index_en.php

It's an option in the HCFR software menus and also available in the help pages of the software. I don't see any mention of what meters are or are not supported on the page you referenced.

KAl


Thank you!
Somewhere in themiddle it says: "You can use a Spyder II, DTP94 or Gretag EyeOne Beamer and Display 2, LT models."

Forgot to say, your guide is great!
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dagarshali



Joined: 27 Nov 2008
Posts: 5
Location: Iowa

Posted: Mon Dec 08, 2008 6:34 pm    Post subject: Help with Calibration

first off, Kal,
Thanks a tonne for putting up a fantastic guide for calibrating. I had posted the question in the general section of calibration and thought it would be more appropriate to post it here.

Mine is a Samsung LN40A650. I am using I1D2 with CHCFR and AVIA DVD and my dvd player is OPPO 980H and I use HDMI input.

I have set all the modifiers like Dynamic contrast, 120hz feature etc to OFF.

I calibrated according to you procedure and have a few questions.
The graphs can be found at this link

http://picasaweb.google.com/dagarshali/CALIBRATION#

If i adjust the brigtness based on the fact that "The Y value at 10 IRE should be equal to 0.65% of Y value at 100IRE", I need to adjust the brightness slider to around 60 or so on my sammy. On the other hand, if used the pluge pattern, I will hae to adjust the brightness slider to only around 45 or so. The question is how reliable is I1 display 2 at 10 IRE?

Also, the TV comes with a gamma setting which can be varied from -3 to +3 in increments of 1. The gamma graph is not close to 2.2. I had set the gamma to be +2 on my TV ? How do I adjust gamma?

I hope I can recieve from input from you guys so that I can calibrate it right this time around

Thanks,
Dagarshali
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mparter



Joined: 08 Dec 2008
Posts: 2


Posted: Mon Dec 08, 2008 7:33 pm    Post subject: SMPTE incorrect after calibration

Hi kal,

I've spent a good few hours following your excellent guide and think I've got a reasonable result (graphs below). Someone on another forum asked me to have a look at the SMPTE colour bars and let him know the results and whilst I thought my end results after calibration were OK, the gray/blue columns/blocks don't merge into one when viewing the SMPTE colour chart with the Blue filter enabled on my TV.

I tried using an SMPTE chart supplied by the person on the forum and the one on the AVSHD disc and both had the same issue. I notice on Wikipedia that there's an HD version, is this likely to be a possible cause for this? Advice appreciated.

Thanks.

Grayscale Measurements
Luminance
Gamma
RGB Levels
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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Mon Dec 08, 2008 9:34 pm    Post subject: Re: SMPTE incorrect after calibration

mparter wrote:
Hi kal,

I've spent a good few hours following your excellent guide and think I've got a reasonable result (graphs below). Someone on another forum asked me to have a look at the SMPTE colour bars and let him know the results and whilst I thought my end results after calibration were OK, the gray/blue columns/blocks don't merge into one when viewing the SMPTE colour chart with the Blue filter enabled on my TV.

I tried using an SMPTE chart supplied by the person on the forum and the one on the AVSHD disc and both had the same issue. I notice on Wikipedia that there's an HD version, is this likely to be a possible cause for this? Advice appreciated.


Sorry, I don't know. I do know that most of these blue-filter thingy's don't work right. Just measure as per the guide instead of using your eyes.

Good results BTW. Nice and flat where it matters.

Kal

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mparter



Joined: 08 Dec 2008
Posts: 2


Posted: Mon Dec 08, 2008 10:13 pm    Post subject: Re: SMPTE incorrect after calibration

kal wrote:
mparter wrote:
Hi kal,

I've spent a good few hours following your excellent guide and think I've got a reasonable result (graphs below). Someone on another forum asked me to have a look at the SMPTE colour bars and let him know the results and whilst I thought my end results after calibration were OK, the gray/blue columns/blocks don't merge into one when viewing the SMPTE colour chart with the Blue filter enabled on my TV.

I tried using an SMPTE chart supplied by the person on the forum and the one on the AVSHD disc and both had the same issue. I notice on Wikipedia that there's an HD version, is this likely to be a possible cause for this? Advice appreciated.


Sorry, I don't know. I do know that most of these blue-filter thingy's don't work right. Just measure as per the guide instead of using your eyes.

Good results BTW. Nice and flat where it matters.

Kal


No problem, thanks for replying.
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kal
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Posted: Tue Dec 09, 2008 1:27 am    Post subject:

No problems! Good luck with the calibration. To me (looking at your graphs) it looks like you already have a really good handle on it! Congrats!

Kal

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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada

TV/Projector: JVC DLA-NZ7

Posted: Tue Dec 09, 2008 1:34 am    Post subject: Re: Help with Calibration

dagarshali wrote:
If i adjust the brigtness based on the fact that "The Y value at 10 IRE should be equal to 0.65% of Y value at 100IRE", I need to adjust the brightness slider to around 60 or so on my sammy. On the other hand, if used the pluge pattern, I will hae to adjust the brightness slider to only around 45 or so. The question is how reliable is I1 display 2 at 10 IRE?

Not great - very few meters (other than the ones that start at $800+ like the Eye One Pro) are going to be great at low stimulus levels. Talk to the pros and they'll tell you that even the EyeOne Pro isn't super accurate at low light levels. That beign said, the EyeOne Display 2 should be fine at lower levels unless you're looking for that last few percentage points of accuracy. (IMHO)

Quote:
Also, the TV comes with a gamma setting which can be varied from -3 to +3 in increments of 1. The gamma graph is not close to 2.2. I had set the gamma to be +2 on my TV ? How do I adjust gamma?

I can't comment on how your TV adjusts gamma or even if what they call gamma means the same thing that we see here. Many TVs have what's called gamma but it does something completely different. The only way I know of adjusting gamma is in good video processors (like Lumagen models) or converters like the Box1020, RTC2200, GammaX, etc. Sorry!

Kal

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hariskar



Joined: 01 Dec 2008
Posts: 18
Location: Greece/Kavala

Posted: Fri Dec 12, 2008 2:29 pm    Post subject:

I can't find eye-one.dll. only i1.sys, *inf etc, but no dll. So HCFR does not recognise my eye-one pro meter. What can I do? Thank you!
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