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Forum: Display Calibration   07-05-2014, 10:12 PM
Replies: 86
Views: 3,761
Posted By TomHuffman
Follow-up

I should point out that my tests were conducted on a 2021. I didn't look at the Mini. I assumed that the performance would be the same. I did some brief tests on the Mini tonight and it would appear...
Forum: Display Calibration   07-04-2014, 11:53 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
The corrections are built-in to the ChromaPure...

The corrections are built-in to the ChromaPure license file. You should have also gotten a calibration report that documents the corrections made. Presumably the information in this document can be...
Forum: Display Calibration   07-04-2014, 02:33 PM
Replies: 14
Views: 883
Posted By TomHuffman
To add some additional information, Of the 1,000...

To add some additional information, Of the 1,000 colors I sampled, only 4 had a dE of 2.0 or higher.

224, 225, 220 dE 3.03
235, 235, 235 dE 2.86
48, 56, 43 dE 2.34
55, 64, 51 dE 2.37

...
Forum: Display Calibration   07-03-2014, 03:25 AM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
You'll have to ask the author.

You'll have to ask the author.
Forum: Display Calibration   07-02-2014, 09:06 PM
Replies: 14
Views: 883
Posted By TomHuffman
5% window, standard background.

5% window, standard background.
Forum: Display Calibration   07-02-2014, 08:22 PM
Replies: 14
Views: 883
Posted By TomHuffman
Update

I just completed the same test on a 9th generation Pioneer Kuro plasma, the PDP-5020FD.

http://www.chromapure.com/pioneer.jpg

There are two aspects of these results that really interest me.
...
Forum: Display Calibration   07-02-2014, 07:57 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
In fact, the Sencore does not support any custom...

In fact, the Sencore does not support any custom colors. That is, it only supports RGBYCMW at 21 levels of intensity. You'll need a more modern signal generator for this.

The disc is a standard...
Forum: Display Calibration   07-02-2014, 07:51 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
We released the Skin Tones update to ChromaPure...

We released the Skin Tones update to ChromaPure AFTER we had released the disc. However, the disc has been subsequently updated. Existing users can get a new version on request.
Forum: Display Calibration   06-28-2014, 12:43 PM
Replies: 86
Views: 3,761
Posted By TomHuffman
I don't have the equipment here to measure...

I don't have the equipment here to measure directly the digital output values. All I can report is that prior to the update there was a measurable difference between test patterns when using the...
Forum: Display Calibration   06-24-2014, 07:34 PM
Replies: 16
Views: 1,029
Posted By TomHuffman
ChromaPure uses xy in the user interface, but it...

ChromaPure uses xy in the user interface, but it uses xyz behind the scenes to create the correction matrix. The math for this is described in this document.
...
Forum: Display Calibration   06-23-2014, 01:47 PM
Replies: 16
Views: 1,029
Posted By TomHuffman
Yes, that's correct. Colorimeters have absolutely...

Yes, that's correct. Colorimeters have absolutely no difficulty measuring luminance, even very inexpensive ones. The filter-based technology, however, can and often does create problems with...
Forum: Display Calibration   06-20-2014, 06:28 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
New Lumagen Firmware

I strongly recommend that all Lumagen users update with the latest firmware just released.

I previously measured a non-trivial difference between the Lumagen (and the Quantum Data) and the AccuPel...
Forum: Display Calibration   06-20-2014, 06:09 PM
Replies: 86
Views: 3,761
Posted By TomHuffman
The Lumagen test pattern accuracy problem is now...

The Lumagen test pattern accuracy problem is now fixed.
Forum: Display Calibration   06-20-2014, 05:40 PM
Replies: 34
Views: 1,241
Posted By TomHuffman
No, it really doesn't. See my post below. In one...

No, it really doesn't. See my post below. In one way it does, while in a more important way it does not.
Forum: Display Calibration   06-20-2014, 05:36 PM
Replies: 34
Views: 1,241
Posted By TomHuffman
My point exactly. Grayscale should be about...

My point exactly. Grayscale should be about chromaticity errors only. If you want to consider luminance errors, then look to gamma. Perhaps I misunderstood what the previous poster was referring to...
Forum: Display Calibration   06-20-2014, 05:33 PM
Replies: 34
Views: 1,241
Posted By TomHuffman
Lab and Luv ALWAYS use relative luminance to...

Lab and Luv ALWAYS use relative luminance to assign a value for lightness in the 0-100 range. Peak white in almost never present in film content, which is a relatively dim medium. In fact, it is...
Forum: Display Calibration   06-20-2014, 02:25 PM
Replies: 34
Views: 1,241
Posted By TomHuffman
Even taking that into account (which you...

Even taking that into account (which you shouldn't), the CIEDE2000 dE is 3.5, assuming a 2.22 gamma.
Forum: Display Calibration   06-20-2014, 10:23 AM
Replies: 34
Views: 1,241
Posted By TomHuffman
dE isn't the problem, it is the way it is being...

dE isn't the problem, it is the way it is being calculated in this case. The CIELUV dE of x0.3108, y0.3176 is 9.3. CIELAB is 6.9. CIEDE2000 is 11.4. However, this screenshot reports only 1.1. This is...
Forum: Display Calibration   06-20-2014, 03:51 AM
Replies: 24
Views: 794
Posted By TomHuffman
You have a 100" 16:9 diagonal screen, yes? Are...

You have a 100" 16:9 diagonal screen, yes? Are you measuring lux with the sensor placed right against the screen surface?

For there to be a discrepancy that large, either there is some problem...
Forum: Display Calibration   06-19-2014, 04:23 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
ChromaPure 2.5.3 Released

ChromaPure 2.5.3 is available for download on the ChromaPure News page (http://www.chromapure.com/news.asp).

This is a small maintenance release focused mainly on improving support for the...
Forum: Display Calibration   06-18-2014, 07:50 PM
Replies: 34
Views: 1,241
Posted By TomHuffman
Since this old issue has come up again, I thought...

Since this old issue has come up again, I thought that I would re-do my initial test, this time using greater precision.

You can see the result by going to our i1Display Pro New Gear article...
Forum: Display Calibration   06-15-2014, 08:32 PM
Replies: 26
Views: 3,689
Posted By TomHuffman
By way of comparison, here are the performance...

By way of comparison, here are the performance data for the Minolta CS-2000.

http://www.chromapure.com/bugtest/performance.gif

As you can see, the Minolta is a good deal slower than...
Forum: Display Calibration   06-14-2014, 09:18 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
I don't mean to single you out, I really don't....

I don't mean to single you out, I really don't. However, this type of issue comes up often enough that I want to comment on the particular type of mistake going on here. Are meters sometimes...
Forum: Display Calibration   06-12-2014, 10:04 AM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
This is a JVC problem. They are notorious for...

This is a JVC problem. They are notorious for this. The only thing you can do on your end is point the meter at the lens and use the diffuser. This will raise the measured light level and help with...
Forum: Display Calibration   06-07-2014, 07:49 PM
Replies: 5,530
Views: 432,732
Posted By TomHuffman
Quote:Originally Posted by...

Quote:Originally Posted by JimP http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1174468/the-official-chromapure-thread/5400_100#post_24804898)

Tom,

Did you test...
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