HCFR - Open source projector and display calibration software - Page 261 - AVS Forum | Home Theater Discussions And Reviews
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post #7801 of 7815 Unread 08-16-2016, 11:13 PM
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I'm getting through my first calibration with an i1display pro on my 55VT60...

I have gotten through greyscale very well but I'm confused about gamma. I turned on continuing measures and used gamma gain on my VT60 for each IRE to get gamma to 2.2 across the board...when I do a post-calibration check however it shows my gamma as being off the charts high at every level (2.9 or so). What am I doing wrong or missing?
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post #7802 of 7815 Unread 08-17-2016, 05:40 AM
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Quote:
Originally Posted by pdawg17 View Post
I'm getting through my first calibration with an i1display pro on my 55VT60...

I have gotten through greyscale very well but I'm confused about gamma. I turned on continuing measures and used gamma gain on my VT60 for each IRE to get gamma to 2.2 across the board...when I do a post-calibration check however it shows my gamma as being off the charts high at every level (2.9 or so). What am I doing wrong or missing?
So you've told HCFR you're targeting 2.2 and are using the Y target numbers on the main grayscale measurement 'spreadsheet' to determine how successful your adjustments are? I never use the chart because at high IREs even small differences can make it look very jagged.
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post #7803 of 7815 Unread 08-17-2016, 08:29 AM
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Quote:
Originally Posted by AMartin56 View Post
So you've told HCFR you're targeting 2.2 and are using the Y target numbers on the main grayscale measurement 'spreadsheet' to determine how successful your adjustments are? I never use the chart because at high IREs even small differences can make it look very jagged.
Oh ok...what am I comparing the Y target numbers to? Y? Should those values be the same or should I be determining Y differently than target Y?
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post #7804 of 7815 Unread 08-17-2016, 09:36 AM
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Originally Posted by pdawg17 View Post
Oh ok...what am I comparing the Y target numbers to? Y? Should those values be the same or should I be determining Y differently than target Y?

Assuming you've told HCFR in the preferences (Advanced -Preferences- References) that you are targetting 2.2 gamma when you run a grayscale pass the Grayscale View will show you the Y target (you may have to page down a bit...it's two fields down from the color coded Delta E). You want the Y value (three fields down from the top) to match or be close to this target (don't over think it...you probably won't be able to get it perfect).

The top Y shows what youre current results are (and will chnage as you adjust the controls). The bottom Y target shows what they SHOULD BE based upon your preferences.

I would suggest starting at one IRE end and working your way up. Use grayscale runs rather than real time reads. Real time reads may bounce around a bit and will just confuse you.

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Last edited by AMartin56; 08-17-2016 at 09:51 AM.
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post #7805 of 7815 Unread 08-17-2016, 12:13 PM
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Quote:
Originally Posted by pdawg17 View Post
I'm getting through my first calibration with an i1display pro on my 55VT60...

I have gotten through greyscale very well but I'm confused about gamma. I turned on continuing measures and used gamma gain on my VT60 for each IRE to get gamma to 2.2 across the board...when I do a post-calibration check however it shows my gamma as being off the charts high at every level (2.9 or so). What am I doing wrong or missing?
Did the luminance at 100% white change before and after you adjusted the gamma? If it remains relatively constant, the post-calibration gamma should be reasonably close to the values you obtained during calibration.

This assumes you were using 10- or 20-pt controls to adjust gamma; with 2-pt gamma everything changes at the same time and it's impossible to predict the post-calibration gamma.

Last edited by Dominic Chan; 08-17-2016 at 12:58 PM.
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post #7806 of 7815 Unread 08-17-2016, 03:11 PM
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Quote:
Originally Posted by AMartin56 View Post
Assuming you've told HCFR in the preferences (Advanced -Preferences- References) that you are targetting 2.2 gamma when you run a grayscale pass the Grayscale View will show you the Y target (you may have to page down a bit...it's two fields down from the color coded Delta E). You want the Y value (three fields down from the top) to match or be close to this target (don't over think it...you probably won't be able to get it perfect).

The top Y shows what youre current results are (and will chnage as you adjust the controls). The bottom Y target shows what they SHOULD BE based upon your preferences.

I would suggest starting at one IRE end and working your way up. Use grayscale runs rather than real time reads. Real time reads may bounce around a bit and will just confuse you.
For a VT60 plasma what "should" my references (in preferences) be? I ran color space on "HDTV - REC 709". I left gamma calculation at default (BT.1886 with 100% input offset). Should I be using something different? Thanks again...
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post #7807 of 7815 Unread 08-17-2016, 03:40 PM
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Originally Posted by pdawg17 View Post
For a VT60 plasma what "should" my references (in preferences) be? I ran color space on "HDTV - REC 709". I left gamma calculation at default (BT.1886 with 100% input offset). Should I be using something different? Thanks again...
It depends. Here is a decent article on the subject.

http://referencehometheater.com/2014/commentary/gamma-correct/
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post #7808 of 7815 Unread 08-21-2016, 10:40 AM
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Ok need some guidance guys...here is my most recent attempt with my VT60 plasma. First issue is that when I do a 10 pt greyscale run it keeps putting one or more points in yellow but when I do continuous measure at that IRE it's in the green no problem.

Second, I'm wondering if I have something set wrong as the difference between Y and target Y for gamma just seems crazy. Even using 10 point gain adjustments I can't get anywhere near target Y.

Contrast 6:1?! Is that due to raising values during my 2-point cal? How to avoid that? Using custom setting with contrast 90, brightness 6

I have reference settings at HDTV REC 709 (75%/75%), gamma calculation at default 1886, 0, 100% (TV set to gamma 2.4) and limited color using an i1display pro.

Any ideas?
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Last edited by pdawg17; 08-21-2016 at 11:58 AM.
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post #7809 of 7815 Unread 08-21-2016, 11:48 AM
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Something is very wrong with your black level, which is throwing everything else off.
Y at 0% should be close to 0.
Hopefully, someone can help you figure out why.

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post #7810 of 7815 Unread 08-21-2016, 01:14 PM
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Quote:
Originally Posted by pdawg17 View Post
Contrast 6:1?! Is that due to raising values during my 2-point cal? How to avoid that? Using custom setting with contrast 90, brightness 6
Your 0 IRE point is brighter than the 10 IRE, so obviously something is very wrong. It's best to restore everything to the factory setting and run a sweep as the baseline, to be able to figure out where the problem is. Also, it's easier to for others to "debug" if you include the HCFR data file (zipped) and not just the screen shot of the measurement data.
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post #7811 of 7815 Unread 08-21-2016, 02:27 PM
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Any ideas?
Hi, you took 0% Black measurement using the 50% Gray pattern, that's why you have 14.243 cd/m2 as Black level.

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post #7812 of 7815 Unread Today, 09:50 AM
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Thanks guys...somehow the pattern generator I was using was doing that. This time around I used GCR (no background). Is that appropriate for a Panny plasma?

In the meantime, I attached the zip with my data. Everything looks pretty good to my eyes other than dark skin tones look too dark. Suggestions?
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post #7813 of 7815 Unread Today, 10:31 AM
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Run the color checker with one of the skin tone patterns.
My Sammy has a separate adjustment for skin tones that actually works pretty well; does your Panny?
Michael

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post #7814 of 7815 Unread Today, 11:43 AM
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Run the color checker with one of the skin tone patterns.
My Sammy has a separate adjustment for skin tones that actually works pretty well; does your Panny?
Michael
Hi, unfortunately the SkinTone slider is available only in Samsung displays. It's doing good job in Samsung's

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post #7815 of 7815 Unread Today, 04:30 PM
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Ok so...what do us Panny plasma users do about it? Gamma is read as 2.29 so should I lower it closer to 2.2? Do that by lowering all colors slightly or use the 10 pt gain setting for gamma?
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