The Official ChromaPure thread - Page 83

BTW, the newer Samsungs are really very nice. They offer 10-pt grayscale adjustment, which gives you good white balance across the entire range. The older Samsungs tended to go very blue below 20%. You can also use the 10pt feature to get a really good gamma response. By adjusting the G gain, you can raise and lower gamma at each point. Then just apply the appropriate amount of R and B to get good white balance.

Some people ask why we don't provide dH, dS, dC data in ChromaPure instead of percentage errors in HSL. We are going to go ahead and add this data to an upcoming build (in addition to % errors), but let me explain why I think that this is not a particularly good way to show color error.

In the first place, I just think it is confusing for the user to see multiple, overlapping delta values. But more important than this is that it just doesn't portray the color error in a way that is useful for a calibrator.

Take a green whose lightness is much too high, but that is only slightly oversaturated.

x0.299, y0.606, Y0.861

This gives
dL: 6.6
dC: 10.3
dH: 0.1

From these numbers you would draw the mistaken conclusion that the biggest problem is with the saturation of the color, when in fact the great majority of the dC value is due to the lightness error. This is the problem with dC. It measures Chroma error, which is a mixture of saturation AND lightness (this is because the luminance of a color influences how we perceive its colorfulness).

Here is the same color using % HSL error values.

H: 0.2%
S: 1.6%
L: 7.5%

The H and L errors look about the same, but the saturation error is now presented correctly. This gives a much more accurate picture of where the problem lies and what needs fixing.

Are we going to see manual control of the iScan Duo in ChromaPure before 3.0 comes out?

I am no longer commenting on exactly when features will be released. The timeline for these types of things is just too fluid and unpredicatable. I will say that we are working on this and it will be available in a future build.

Stacey Spears, Co-Creator of Spears & Munsil High Definition Benchmark, posted the following comment 15 days before:

''Still making slow progress on the 3D disc. Authoring is really the big hold up. We are close to finishing up all of the content. Re-grading the new 3D montage at the moment. I started encoding the window patterns yesterday. We have 0% to 100% in steps of 10% in normal window, equal-energy window, and fields. All in white, red, green, blue, cyan, magenta, and yellow. All available in 2D and flat 3D.''

I didn't ask "exactly when". What I was really asking was will the Duo control be available to people who don't upgrade to ChromaPure 3.0, or will it be only included as part of the upgrade?

I am a big supporter of your software, and I will most definitely do the upgrade, whenever it happens.

Great! thanks!

Hi Tom ,
Are you referring to the 2012 Models and if so which Technology , LCD or Plasma?
Scott................

600 series or greater, all techs, last 2-3 years.

Hi Tom,


I would like to know if I can buy a licence or a version of Chromapure and use an OEM I1Display PRO probe purchased previously with Calman for exemple.

Sure.

I just got a Sharp LC-80LE632U and have a question as to how to use the CMS with this set. I have only calibrated the Samsung and Panasonic plasmas (GT30). These sets use RGB and is pretty straightforward in how they're calibrated. The Sharp has HSV and when I got to the color management the only thing that made sense was to use the HSL mode. Is that correct?
I also have a Radiance Mini that I use and after I got the display as best I could I hooked up the mini and tweaked it from there. I was able to get the colors pretty good except for the red, which is a known issue, and the best I could get is a +4 DE.
I'm attaching the report from the final calibration and wondered if anyone has any insight or tips that they could share.
TIA

 

Sharp Report 1.pdf 288.771484375k . file

That can advise?

http://www.flickr.com/photos/79648630@N04/6982554798/
http://www.flickr.com/photos/79648630@N04/6982553584/
http://www.flickr.com/photos/79648630@N04/7128637757/
http://www.flickr.com/photos/79648630@N04/6982551396/
http://www.flickr.com/photos/79648630@N04/7128635141/

http://narod.ru/disk/47698930001.6c8...eport.pdf.html

For calibration purposes V is the same as L. Report looks good, except red is undersaturated, and there's not much you can do about that.

Blue is not very good on this display.

Tom, I don't know if this has been mentioned yet. With the latest CP in advanced CM, using the internal PC pattern generator, the read all button doesn't work right. It does fine for a while, then it goes haywire and all sorts of weird things start happening. Different screens start popping up in CP and it acts like a macro got off track.

Chad, it works. You just have to be careful to:

• start it with white already selected
• start it with the meter already initialized and the pattern generator setup and ready to function
• don't touch the mouse or keyboard until it has finished.

See this demo

http://www.chromapure.com/bugtest/acm/acm.html

Thanks Tom, I'll make double sure next time. I thought I did all that, but I might have touched the mouse or KB.

Thanks Tom

Hey guys,

Received my X-Rite EyeOne Display 3 pro last week and I will give the calibration a try over the week-end, I have a lumagen Radiance so it should be fairly easy I hope, I was wondering what kind of test pattern I should be using 100 or 75 saturation and windowed or full screen?

I will be calibrating a Sony VW-1000ES projector on 1.0 gain screen, what should I be doing with the Iris, I usually run it in full auto mode and I would like to keep it that way since I like the results but for the calibration, shall I leave it on or turn it off and if off will the calibration results be 'correct' for when I watch movies with the iris on?

Thanks!

Note: The Lumagen test patterns for the 75% of Rec. 709 are not outputting correct values. We are working with Lumagen to get this resolved ASAP.

Use full field test patterns for front projectors.

Tom, can be done so that the data in chromapure was editable as HCFR?

The only reason to edit measured data is for data modeling. At least that is the only reason I can think of.

We have a Module just for that purpose (Conversion Utility).

No. I have Spyder 4 and ColorMunki Photo.
Data can not ColorMunki Photo use in chromapure for comparison Spyder 4.

Tom: Thanks for the heads up. Any idea which firmware update caused this?

Thanks Tom.

About this Iris do I switch it off for the calibration, I saw you recommended earlier to have it off but should I be doing that even if I turn it back on after the calibration and will this impact the final results on screen (ie. calibration with iris off vs. watching movies with iris on)

Thanks

Is the dE in this report/module using the CIE94 formula? Is it fixed to CIE94 for this module or can it be anything selected in the options menu?

Also, does the saturation portion of this module expect a given % stim (such as 75% or 100% only) or can any % stim be used? Is there an option where it has to be set to the desired value?

One more question is can the chromaticity plots be in UV format or is XY the only format available?

 

AdvancedColorManagementReport LG Lcd.pdf 465.7548828125k . file

They recently added a new custom color command that we tried out and just didn't implement correctly. We've now fixed it and will release in a day or two.

I would.

It uses CIE94 only. That is the best metric for grading color performance.

You can use any level of % you like for the saturation sweep.

CIE charts are useful for getting a rough snapshot of color performance only. We use xy just because it is more familiar to most people. dE calculations, which are a much more precise metric, use Luv or Lab data. CIE94 uses Lab.