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Discussion Starter #541

Quote:
Originally Posted by kha0tic /forum/post/21957887


That's excellent zoyd. Someone got onto this even sooner that I was hoping. I'm looking at putting in the functionality to generate ccss files directly from HCFR at the moment (while John works on the more important stuff
). This should make it easier for people to make and upload them so that we hopefully get a big database of files for a wide variety of displays. This one you've made should be a big improvement over not using any correction for a plasma.

From what I've seen there is no point to using the spectral fits unless a better correction algorithm can be designed, a matrix correction which empirically solves to match specific target locations is clearly better (so far).
 

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Quote:
Originally Posted by zoyd /forum/post/21957923


From what I've seen there is no point to using the spectral fits unless a better correction algorithm can be designed, a matrix correction which empirically solves to match specific target locations is clearly better (so far).

I use a ccss for my DELL U2711. Probably not as good as a ccmx for that specific configuration of display, colorimeter and spectrophotometer, but it's a lot better than no correction IMHO.
 

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Discussion Starter #543

Quote:
Originally Posted by kha0tic /forum/post/21958008


I use a ccss for my DELL U2711. Probably not as good as a ccmx for that specific configuration of display, colorimeter and spectrophotometer, but it's a lot better than no correction IMHO.

Well the theory is that a ccss file is better to distribute because of meter variability. For example if my i1d3 was not "typical" or had drifted, then the correction matrix I build for it would be of no use to someone else and it would be better to use just the display spectral distribution and have the end user build his/her own matrix. But if both the source meter and end user meter are within factory specs then the matrix correction will be better.
 

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Quote:
Originally Posted by zoyd /forum/post/21958059


Well the theory is that a ccss file is better to distribute because of meter variability. For example if my i1d3 was not "typical" or had drifted, then the correction matrix I build for it would be of no use to someone else and it would be better to use just the display spectral distribution and have the end user build his/her own matrix. But if both the source meter and end user meter are within factory specs then the matrix correction will be better.

The i1d3 has demonstrated low inter-unit variability, close to that of the top performing BasICColor Discus, and lower than the i1pro. So then theoretically it's always going to be better to produce a ccmx. It's accuracy is also among the best. The results of the test are worth reading if you've not seen it before
 

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Discussion Starter #545
Thanks for the link, I hadn't seen that rack-up before. The i1d3 variability results are truly impressive. I think the best approach for plasma users of the d3 will be to get hold of a correction matrix based on a high-end spectrometer but I don't know any DiYers who have one. Barring that the i1pro would be the next best choice, although I was a bit surprised by the mean dE2000 of ~4 for the white point comparison between the i1pro and the reference.
 

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After having 2 i1d2 units drift after only a year, even though the i1d3 looks to be a better device, no one knows yet if it will drift as badly as the i1d2. Hopefully not, as it is manufactured to a better standard (sealed optics) however the colorimeter filters can still drift with age.


And there is nothing worse than doing a calibration with a unit where you don't know for sure if it is still accurate. I think the common approach of using a spectometer like the i1 pro to train/profile a colorimeter (to compensate for any drift) is a better approach especially for the long term as spectrometers exhibit very little drift with age.
 

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So that article is claiming the i1Dpro/D3 is 4x more accurate (1.1 vs 4.4) than the i1pro at the upper range for a standard gamut display and slightly more accurate on wide gamut.


I realize the i1pro should work more effectively on a wider range of display types and can be used to create a custom profile for each individual display vs generic tables but if the Display Pro/D3 covers the most common techs why use an i1Pro for profiling the Dpro/D3 to those techs if it is truly up to 4x more accurate?


Have we all been duped here...


Jason
 

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Quote:
Originally Posted by DaGamePimp /forum/post/21960416


So that article is claiming the i1Dpro/D3 is 4x more accurate (1.1 vs 4.4) than the i1pro at the upper range for a standard gamut display and slightly more accurate on wide gamut.



Have we all been duped here...


Jason

That's indeed new to me. From what I've read ( mostly at AVSforum), D3 colorimeter can't compare to spectro like i1 Pro in both standard/wide gamut reading. I know D3 is a reliable product and have better dark reading than i1 Pro but from that article it's even more reliable than an industry standard spectro in both accuracy and Unit-to-unit variability
.


Can someone confirm this?
 

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Given the accuracy of the sensor used as the reference instrument, the number of samples tested, and the simple experimental design, it's hard to dismiss the results of these tests. There's a fairly extensive discussion of them with the author of the test suite over here . I'll note that it's fairly common in the tech industry to see wide leaps in capability from generation to generation.
 

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Discussion Starter #551
I'd have to see the full dataset and test set-up. The first inconsistency is that the i1pro variability is 2 dE but the absolute agreement is only 4 dE. This says that there is a true systematic offset between the photoresearch and the i1pros, likely due to the set-up (perhaps field of view given that the test object was an LCD).
 

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Do these meters drift from use, or do they also drift during storage? I've been keeping my i1d3 inside a ziploc bag in a drawer. I have a small supply of silica gel desiccant bags, so I could put one in with the meter, but not sure if that might make things worse.


If the varience between i1d3 meters is that low then zoyd's comment about creating a correction matrix with a high-end spectrometer would really be the ideal solution... well at least for anyone with an i1d3 meter. I knew a guy years ago who might have been able to do this but no idea how to get hold of him now. Wonder how much it would cost just to have a pro create a ccmx file.


If anyone is interested the site www dot freelists dot org has numerous threads covering Argyll, meter comparisons, etc. Their discussions are over my head but maybe someone here might find them beneficial.
 

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Quote:
Originally Posted by zoyd /forum/post/21957392


I created a spectral sample file using an i1pro on my plasma and the Dispcalgui software.

Zoyd, could you upload the two .ti3 files created during this measurement process so I can use them to test code? Thanks...
 

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Quote:
Originally Posted by 65Cobra427SC /forum/post/21961406


Do these meters drift from use, or do they also drift during storage? I've been keeping my i1d3 inside a ziploc bag in a drawer. I have a small supply of silica gel desiccant bags, so I could put one in with the meter, but not sure if that might make things worse.


If the varience between i1d3 meters is that low then zoyd's comment about creating a correction matrix with a high-end spectrometer would really be the ideal solution... well at least for anyone with an i1d3 meter. I knew a guy years ago who might have been able to do this but no idea how to get hold of him now. Wonder how much it would cost just to have a pro create a ccmx file.


If anyone is interested the site www dot freelists dot org has numerous threads covering Argyll, meter comparisons, etc. Their discussions are over my head but maybe someone here might find them beneficial.

Theoretically one could just keep the spectro .ti3 readings for a specific display stored on disk and periodically recreate a ccmx file by taking new readings from the colorimeter. That would deal handily with any drift.
 

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Discussion Starter #555
Quote:
Originally Posted by kha0tic
Zoyd, could you upload the two .ti3 files created during this measurement process so I can use them to test code? Thanks...
here ya go...

 

i1pro_i1d3_ti3.zip 6.9580078125k . file
 

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Quote:
Originally Posted by kha0tic /forum/post/21961868


Theoretically one could just keep the spectro .ti3 readings for a specific display stored on disk and periodically recreate a ccmx file by taking new readings from the colorimeter. That would deal handily with any drift.

Interesting thought... need to find a spectro friend
 

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Much of this is way over my head!


Can I ask, If in purchase an i1 Display Pro, is it just plug in, select and play if i down load the latest version?
 

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Quote:
Originally Posted by ndaa75 /forum/post/21971767


Much of this is way over my head!


Can I ask, If in purchase an i1 Display Pro, is it just plug in, select and play if i down load the latest version?

Pretty much yes, if you have an "odd" display type there is an extra step to extract the profiles but this is pretty painless in practice.


John
 

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