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The Official ChromaPure thread - Page 135

post #4021 of 4386
3/16/13 at 2:25pm
Quote:
Originally Posted by maximus74 View Post

Tom
I made the measurements in chromapure module for black level 0,002 and white level 44cd/m2.It is normal this value for black level?
There is another way to find out,to be sure it is correct?
Do you recommend in auto cal B.T.1886 or gamma 2.22?for better results.
Thanks
Yes, that sounds reasonable, 22,000:1 CR.

You can take black and white readings directly from the lens using the meter's diffuser to get a contrast ratio, then use that number along with a normal reading of 100% off the screen to calculate black level.
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post #4022 of 4386
3/16/13 at 4:00pm
The problem is if I close the lid from my laptop the reading for black level is 0,if I open the lid I get 0,002.
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post #4023 of 4386
3/16/13 at 6:26pm
Quote:
Originally Posted by TomHuffman View Post

The 21-point is a complete waste of time. The results are exactly the same regardless of which you do, with possibly one exception. You may want to tweak 5% (this is entirely optional). There is simply no reason to more than double the time of the process just out of a concern for one point (5%). In fact, we are going to remove it as an option from the next release. Do an 11-point and then tweak 5% if so inclined.

Thanks, I have been using 11 point, but was curious. Light Source and Calman seem to use that as part of the 3D LUT strategies for the the Color Box so it made me wonder.
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post #4024 of 4386
3/17/13 at 1:52am
Hello,


After this attempt i tried another for Gamma 2.22 but failed again.I couldn't save the report.mad.gif
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post #4025 of 4386
3/17/13 at 2:27am
Last night I re worked my greyscale and gamma last night as the autocal version was a but bumpy, which I put down to the single readings for each point (as they do tend to jump around a little if you watch a continuous reading). I changed the readings to '5' but not sure if I should use 'mean' or 'median'. Is there a preference and is there any point going higher than 5 readings (it didn't take too long even reading the 10% value, so I could live with a longer read time if it's worthwhile (just for the final manual tweaking). Is it worth increasing the reading o more than 1 for the autocal (I know it will increase the time, but would 2 readings take double the time?).

I used the gamma module and just left it reading continuously while a tweaked the luma and RGB controls at each level. When I re ran the greyscale I got a nice flat response (bar an intended dip towards 2.1 at the low end to avoid black crush/improved shadow detail). I also dropped from 21 point down to 12 point which retained my 1% adjustment setting (it's a JVC X35 and seems to benefit from a slight boost using 1%), so a slight variation on using the 11 point as Tom recommends. I took a couple of readings at 5% intervals and they were pretty good too, so as Tom says the extra time isn't worthwhile runing 21 point.

I didn't have time to re run the advanced colour gamut autocal, but just ran a quick check at 75% and the results were still good from the original autocal with dEs less than 2.0 anyway. I'll re run another night since I have made a small adjustment at 100% in the projector controls when re touching the greyscale last night, so perhaps it will benefit from another run. However, I've never seen the charts as shown at the bottom of the above post that show the 'Advanced Colour Management report' so can someone tell me where to enable that option to ensure I see that report?
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post #4026 of 4386
3/17/13 at 3:46am
Kelvin,
It is not in calibration report for auto cal,you must enter in ACM module and read manually with test patterns from Lumagen,after the auto cal is completed.
Edited by maximus74 - 3/17/13 at 9:22am
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post #4027 of 4386
3/17/13 at 3:46am
Quote:
Originally Posted by TomHuffman View Post

The 21-point is a complete waste of time. The results are exactly the same regardless of which you do, with possibly one exception. You may want to tweak 5% (this is entirely optional). There is simply no reason to more than double the time of the process just out of a concern for one point (5%). In fact, we are going to remove it as an option from the next release. Do an 11-point and then tweak 5% if so inclined.

Hi Tom,

Is this a 'fact of life' applicable to all Displays irrespective of their type or even linearity and also is it because a 10% change is sufficient to overcome any interpolation errors or some other reason applicable to just D65 point?

Afraid that technical matters are sometimes confusing to me.
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post #4028 of 4386
3/17/13 at 4:57am
Ah thanks for that explanation Maximus74. I've been meaning to have a look at that ACM module, but haven't had much time for calibration lately (too busy either watching films or doing other stuff eek.gif).
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post #4029 of 4386
3/17/13 at 3:24pm
Tom,
Every time when I exit from my chromapure I have the following message "There was an error generating the XML document".
Thanks
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post #4030 of 4386
3/17/13 at 5:24pm
Quote:
Originally Posted by maximus74 View Post

Hello,


After this attempt i tried another for Gamma 2.22 but failed again.I couldn't save the report.mad.gif
Spend about 5 minutes on a little touch-up here and there, otherwise I see no problems with this. The average dE for the 125-point is 1.2.
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post #4031 of 4386
3/17/13 at 5:27pm
Quote:
Originally Posted by Kelvin1965S View Post

Last night I re worked my greyscale and gamma last night as the autocal version was a but bumpy, which I put down to the single readings for each point (as they do tend to jump around a little if you watch a continuous reading). I changed the readings to '5' but not sure if I should use 'mean' or 'median'. Is there a preference and is there any point going higher than 5 readings (it didn't take too long even reading the 10% value, so I could live with a longer read time if it's worthwhile (just for the final manual tweaking). Is it worth increasing the reading o more than 1 for the autocal (I know it will increase the time, but would 2 readings take double the time?).

I used the gamma module and just left it reading continuously while a tweaked the luma and RGB controls at each level. When I re ran the greyscale I got a nice flat response (bar an intended dip towards 2.1 at the low end to avoid black crush/improved shadow detail). I also dropped from 21 point down to 12 point which retained my 1% adjustment setting (it's a JVC X35 and seems to benefit from a slight boost using 1%), so a slight variation on using the 11 point as Tom recommends. I took a couple of readings at 5% intervals and they were pretty good too, so as Tom says the extra time isn't worthwhile runing 21 point.

I didn't have time to re run the advanced colour gamut autocal, but just ran a quick check at 75% and the results were still good from the original autocal with dEs less than 2.0 anyway. I'll re run another night since I have made a small adjustment at 100% in the projector controls when re touching the greyscale last night, so perhaps it will benefit from another run. However, I've never seen the charts as shown at the bottom of the above post that show the 'Advanced Colour Management report' so can someone tell me where to enable that option to ensure I see that report?
He just ran the reports from the Advanced Color Management module, which is a valid way to check the 125 point, beyond the average dE value provided in the native report.
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post #4032 of 4386
3/18/13 at 3:51am
Thanks Tom, something I'm going to try later this week. smile.gif
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post #4033 of 4386
3/18/13 at 7:07pm
I'm new to Chromapure, Lumagen, and autocal.

The Lumagen has several different CMS memories. Which one does autocal adjust?
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post #4034 of 4386
3/18/13 at 7:27pm
Quote:
Originally Posted by ScottJ View Post

I'm new to Chromapure, Lumagen, and autocal.

The Lumagen has several different CMS memories. Which one does autocal adjust?
Whatever CMS is active when you run it.
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post #4035 of 4386
3/19/13 at 1:04am
Hello,Tom
Every time when I exit from my chromapure I have the following message "There was an error generating the XML document".
Thanks
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post #4036 of 4386
3/19/13 at 2:57pm
ChromaPure 2.4 Released

ChromaPure 2.4 is now available for download. This is a free upgrade for licensed 2.x users.

This release includes a new manual control tool for both the DVDO Duo and the Lumagen Radiance (beta). It also includes a new ColorChecker tool, and numerous other upgrades.

A download link and complete Release Notes are available on the ChromaPure News page.

Note: We also added new video demos showing how the Signal Generator Manual Control Toolbar works
Edited by TomHuffman - 3/19/13 at 3:45pm
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post #4037 of 4386
3/19/13 at 3:17pm
Great news! Read the updates, looks like a lot of very cool things!
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post #4038 of 4386
3/19/13 at 3:49pm
When generating reports, using a Lumagen as the pattern generator, is there a way to have Chromapure run through all the patterns in one click? The only way I can find is to sit there clicking "Measure" over and over, once per meter reading. Since the patterns are being generated automatically, this seems unnecessary.
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post #4039 of 4386
3/19/13 at 5:22pm
Quote:
Originally Posted by ScottJ View Post

When generating reports, using a Lumagen as the pattern generator, is there a way to have Chromapure run through all the patterns in one click? The only way I can find is to sit there clicking "Measure" over and over, once per meter reading. Since the patterns are being generated automatically, this seems unnecessary.
Options, Signal Generators, Auto-Advance.
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post #4040 of 4386
3/19/13 at 9:10pm
Get the latest version of ChromaPure 2.4 at a heavy discount + the Display 3 Pro meter for FREE!

www.avsforum.com/t/1464259/chroma-pure-2-4-professional-discounted-with-free-display-pro-3-meter
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post #4041 of 4386
3/19/13 at 9:51pm
Quote:
Originally Posted by TomHuffman View Post

Options, Signal Generators, Auto-Advance.

OK I see that. What I don't understand is the "Advance every [3.0] seconds" setting. Shouldn't Chromapure know when it's done taking the measurement, and advance only at that time?
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post #4042 of 4386
3/19/13 at 11:31pm
I suppose uninstalling 2.3X is needed Tom?
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post #4043 of 4386
3/19/13 at 11:39pm
Installing new versions always requires an uninstall of the previous version.
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post #4044 of 4386
3/20/13 at 1:45am
Love the ColorChecker, well done Tom.

These non calibrated patterns are invaluable in seeing how the well chosen interpolated patterns perceive the calibrated ones no matter whether it is 5x5x5 or just single point saturation (like my DUO).

Used Advanced CM to check out my DUO and this now verifies its diagnostics.

Just found the Manual Control for my DUO and used your apparently re written 'help' pages to find it.

All very impressive stuff Tom.

I notice this manual control uses in its fields R,G,B and Y.
Can I change this to x.y Y anywhere? Sorry if I've missed it.

Further update, notice that in manual control changes from R,G,B,Y fields to x,y,Y after doing grayscale and changing to Colour measurement.

In Colorchecker I notice you use dE values of CIE94 rather than dE2000.
Your help says lower values are better. so what is the scale of high compared to low with CIE94 as against say dE2000 and visible / non visible values?
Edited by PE06MCG - 3/20/13 at 3:27am
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post #4045 of 4386
3/20/13 at 6:42am
No fix for international keyboard lay-outs? Or just not listed?
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post #4046 of 4386
3/20/13 at 7:05am
Dear Tom!

illuminant D65 ColorChecker = 24 point color checker from CALMAN ?
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post #4047 of 4386
3/20/13 at 8:37am
I think you will find Colorchecker mentioned in both these old Tec papers:

http://tech.ebu.ch/docs/tech/tech3325.pdf

http://tech.ebu.ch/docs/tech/tech3237.pdf
Edited by PE06MCG - 3/20/13 at 8:44am
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post #4048 of 4386
3/20/13 at 8:49am
Quote:
Originally Posted by anta1974 View Post

Dear Tom!

illuminant D65 ColorChecker = 24 point color checker from CALMAN ?
The ColorChecker is an idea originally put forward in1976 paper by McCamy, et. at. Since then it has been widely used in the photographic industry. I based my color checker in the specs provided on the Bruce Lindbloom site, which provide a more contemporary adaptation of McCamy's original.
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post #4049 of 4386
3/20/13 at 8:59am
Are we able to pick Bt.1886 targets for a manual gamma calibration?
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post #4050 of 4386
3/20/13 at 9:32am
Quote:
Originally Posted by Skood View Post

Are we able to pick Bt.1886 targets for a manual gamma calibration?
No....frown.gif
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