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Tips and Tricks Light Illusion Forums / Tips and Tricks /  
 

What happens if a Probe is inaccurate, or uses incorrect matrices?

 
Author Steve

INF
Male
#1 | Posted: 15 Mar 2022 19:17 
Using a probe that is inherently inaccurate, or has an incorrect matrix selection, can do more than just cause inaccurate calibration.
It can cause the verification to be inaccurate, as the initial inaccuracy is not cancelled-out by using the same inaccurate probe for the verification.

https://www.lightillusion.com/probe_accuracy.html

Steve
Steve Shaw
Mob Boss at Light Illusion

Author stuart_p
ZRO
#2 | Posted: 16 Mar 2022 00:38 
Ah Mr Shaw! Good article, very good. I continue to be amazed by people who think they can get any old edr and expect the calibration to be perfect. May be though in the lower cost versions of CS, you allow or purchase an add on or time limit, whatever, where the user can use an expensive spectro to create a probe match for their wide gamut display? (if they can get hold of one of course). Just a thought.

Author Steve

INF
Male
#3 | Posted: 16 Mar 2022 08:32 
stuart_p
As you can manually enter the RGBW values from any probe into Probe Matching you can actually use any Spectro for Probe Matching with any license level of ColourSpace.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author nlucena
ZRO
Male
#4 | Posted: 16 Jul 2023 15:50 
I had a question after reading this. Since we can manually enter the spectro value does this mean technically i can just enter the values for the Klein instead of taking readings to create a pm for it. Example i place the spectro in the center of the screen perform probe match for the Jeti/spectro and then when i hit new to create the one for the Klein i can just manually enter these values in without actually having it take any readings. Would this be the same or more accurate or not recommended? sorry if this is a dumb question in advance .

Author RollsRoyce
DPS
#5 | Posted: 16 Jul 2023 16:45 
nlucena
Steve will know more, but I'd think that wouldn't necessarily be a good thing. For one, if you are using values captured in a different measurement session, you may run afoul of the inter-session meter and display repeatability specs. IMHO, it's far better to do the measurements in the same session. The lower license levels can't do the same matching to higher-spec meters with direct reading, so delayed, manual entry is an (the only) option for them.

Author nlucena
ZRO
Male
#6 | Posted: 16 Jul 2023 17:29 
I have the pro license if that makes a difference. Says ZRO under my username though . Thanks Royce for the feedback. I would only try this in the same session usually just to do the meter profile and then do the rest of the calibration with the Klein. Thats all i use my Jeti for so far and also since Ted recommended i use it when i do the service menu white balance calibration. Then i jump into to colorspace to begin the meter profile.

Author Steve

INF
Male
#7 | Posted: 17 Jul 2023 09:09 
How probe readings are entered into the Configure Matching window is really irrelevant, assuming the screen and probe are 'stable'.
But why would you manually enter them, when ColourSpace can do it automatically?

Steve
Steve Shaw
Mob Boss at Light Illusion

Author nlucena
ZRO
Male
#8 | Posted: 17 Jul 2023 15:08 
I would rather let colorspace do it as usual. I only thought about this since because in other software like calman when we do a meter profile using there meter profile workflow. sometimes by the time i place the klein in the same spot and the meter profile sometimes doesnt come out right and takes a couple tries. I thought this would be a easy way to make sure they are reading the same without worry of the panel changes if they are any.

Author Steve

INF
Male
#9 | Posted: 18 Jul 2023 09:13 
I think the issue with Calman are related to Calman - never seen any such issues with ColourSpace.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author nlucena
ZRO
Male
#10 | Posted: 18 Jul 2023 20:29 
Yea the meter profiling in colorspace seems to work great. When i read with my meter i get the same reading as the JETI when using the Klein after i got when resading a patch. It was just my curiosity. Thanks Steve.

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 What happens if a Probe is inaccurate, or uses incorrect matrices?

 

 
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