Latest Calman 5.2.3 meter profile at 75% stim buggy - AVS Forum
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post #1 of 10 Old 01-25-2014, 06:17 AM - Thread Starter
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Just a heads up with a question on the side:

Has anyone seen this behavior I encountered:

I'm using following hardware:

1) Iscan Duo as pattern generator
2) i1 display 3 OEM as colorimeter
3) i1 pro 2 as spectrophotometer

As for software, I'm on the latest Calman version 5.2.3.
Please also refer to this topic for details http://www.spectracal.com/forum/viewtopic.php?f=94&t=5142

The bug (at least I think it is a bug) is as follows:

When I select 75 as stimulus level when creating the profile, it is only valid until I close and reopen the Calman software. After reopening, the profile is not accurate anymore and has suddenly become unusable (inacurate). As long as I do not close Calman, I can actually use the profile perfectly.

A few (seemingly) unrelated settings I have changed:

At the Workflow Basic Options screen:

- Gamma formula: power with exponent 2.2 selected
- Color checker settings: 100% saturations checked

At the Workflow Advanced Options screen:

- Black level target 0,0 fL

best regards,
Jeroen

My gear: Panasonic TH-42PF11EK pro plasma display. -- Iscan Duo video processor -- i1 display 3 colorimeter -- i1 pro 2 spectrometer
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post #2 of 10 Old 01-25-2014, 07:05 AM
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Maybe related, I found when using the free color checker that manually entered corrections behaved the same way. Good until close but when re-opened the correction was "baked in". In other words the profile was active automatically and selecting it from the profile options would apply it twice.
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post #3 of 10 Old 01-25-2014, 07:27 AM - Thread Starter
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Testwithmeterprofiling2.xlsx 198k .xlsx file Forgot to mention it works fine when using 100%. I added a little Excel comparing the profile before and after the reboot for people not having access to the Spectracal forum and I've also alerted Spectracal support.
see "Profile not working anymore?" on tab 2 of the Excel workbook.

It is actually worse than not profiling.

I believe it is advisable to profile at 75%. Can't remember why though...Is it safe to go ahead with the 100% stim. profile or would that just waste time ^^?
Attached Files
File Type: xlsx Testwithmeterprofiling2.xlsx (197.5 KB, 35 views)

My gear: Panasonic TH-42PF11EK pro plasma display. -- Iscan Duo video processor -- i1 display 3 colorimeter -- i1 pro 2 spectrometer
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post #4 of 10 Old 01-25-2014, 11:02 AM
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Quote:
Originally Posted by zoyd View Post

Maybe related, I found when using the free color checker that manually entered corrections behaved the same way. Good until close but when re-opened the correction was "baked in". In other words the profile was active automatically and selecting it from the profile options would apply it twice.
Zoyd, you can make a profile d3/i1pro with the free calman colorcvhecker ? Thanks

Edit : i see you have enter manualy the XYZ coordinates, this coordinates is from profiling in hcfr ?
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post #5 of 10 Old 01-25-2014, 01:04 PM
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Quote:
Originally Posted by realzven View Post


Zoyd, you can make a profile d3/i1pro with the free calman colorcvhecker ? Thanks

Edit : i see you have enter manualy the XYZ coordinates, this coordinates is from profiling in hcfr ?

CalMAN includes a utility to generate a matrix from x,y,Y values.

It's called the Four Color Matrix.

Joel Barsotti
SpectraCal
CalMAN Lead Developer
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post #6 of 10 Old 01-25-2014, 01:06 PM
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Quote:
Originally Posted by Jeroen1000 View Post

I believe it is advisable to profile at 75%. Can't remember why though...Is it safe to go ahead with the 100% stim. profile or would that just waste time ^^?

We used to recommend 75%, because that was the stimulus level that most gamut calibration was performed at. If you are doing a cube, or are going to be looking at the gamut across a range of stimulus percentages (color checker, ect...), then doing it at 100% makes sense.

Joel Barsotti
SpectraCal
CalMAN Lead Developer
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post #7 of 10 Old 01-25-2014, 01:58 PM - Thread Starter
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I can't really see a reason to favor 100% over 75%? Is there a possibility 100% stim. yields a LESS accurate profile than 75% stim?
Would you happen to know someone is looking into the potential bug?

Thanks I always enjoy your feedbacks!

My gear: Panasonic TH-42PF11EK pro plasma display. -- Iscan Duo video processor -- i1 display 3 colorimeter -- i1 pro 2 spectrometer
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post #8 of 10 Old 01-25-2014, 02:16 PM
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Ted wrote



Examples / Why we have to always profile with 100% Amplitude patterns with i1pro1/2:

If you have a Display with White @ 120cd/m2 with Gamma 2.2:

If you perform profiling with 100% Amplitude Patterns then you will have:

100% White @ 120 cd/m2
100% Blue @ 8,6 cd/m2

If you perform profiling with 75% Amplitude Patterns then you will have:

75% White @ 63,5 cd/m2
75% Blue @ 4,5 cd/m2

If you have a Projector with White @ 14fl = 48cd/m2 with Gamma 2.2:

If you perform profiling with 100% Amplitude Patterns then you will have:

100% White @ 48 cd/m2
100% Blue @ 3,4 cd/m2
100% Red @ 10,2 cd/m2

If you perform profiling with 75% Amplitude Patterns then you will have:

75% White @ 25,4 cd/m2
75% Blue @ 1,8 cd/m2
75% Red @ 5,4 cd/m2


And i1 pro is not great at low level therefore get as much light as possible (some say it's only accurate above 10cd/m2
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post #9 of 10 Old 01-26-2014, 02:44 AM
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BTW This Meter Profiling Check layout page is useful for users to check if their meter profiling correction table is accurate.

I'm sure you will be surprised when you will find out that your familiar meter profiling procedure you followed since now maybe has create some not valid tables for some reason but you haven't realized that this is be possible because you have always followed the correct way but you haven't checked it.

Use this Reference Meter Page to take WRGB measurements using your Spectro and after that run your meter profiling procedure. (re-measure again the WRGB patches using your spectro and colorimeter)

Later, use the Profiled Meter Page to measure the WRGB Patches with your Profiled Meter to see if the correction table is accurate vs. your reference meter readings.

You will found that sometimes it will need to re-perform your meter profiling 2-3 times to get you accepted results. Count also your meter repeatability/display instability here that maybe produce inaccurate meter correction tables.

This workflow page is included to CalMAN 5 Workflows for Ted's LightSpace CMS Calibration Disk Users.

Anyone who has time he can design something similar for his own custom workflow, since I'm giving this out to my disk users only. wink.gif

Ted's LightSpace CMS Calibration Disk Free Version for Free Calibration Software: LightSpace DPS + CalMAN ColorChecker
S/W: LightSpace CMS, SpaceMan ICC, SpaceMatch DCM, CalMAN 5, CalMAN RGB, ChromaPure, CalPC, ControlCAL
Meters: JETI Specbos 1211, Klein K-10A, i1PRO2, i1PRO, SpectraCAL C6, i1D3, C5
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post #10 of 10 Old 01-26-2014, 11:31 PM
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Quote:
Originally Posted by sotti View Post

CalMAN includes a utility to generate a matrix from x,y,Y values.

It's called the Four Color Matrix.
I know for the FCM joel, my question is can we make a FCM with the free colorchecker ?
Thanks wink.gif
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