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Author Topic: Measuring color temperature of a light source  (Read 2034 times)

rxchaos

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Measuring color temperature of a light source
« on: March 29, 2018, 12:32:16 PM »

Hello,

I've use XRite's i1Profiler with the i1Pro2 spectrophotometer to create my icc profiles and use the D50 lighting conditions for my profiles.  Is there is a method to measure light sources with the i1Pro2 and i1Profiler or another application and use your own custom lighting settings instead of D50. 

I ask because I have a GTI Vertical Print viewing unit and was curious to know if that unit outputs D50 light.

-c
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #1 on: March 29, 2018, 12:35:05 PM »

i1Profiler should allow this measurement. What you can save out (cfx) and what other applications can accept this is questionable. Within i1P, you can build a profile from a measurement such you can now use it to build a profile there.

And no, the GTI nor any man made illumination produces D50.

http://digitaldog.net/files/22Thecolorofwhite.pdf
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Andrew Rodney
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rasworth

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Re: Measuring color temperature of a light source
« Reply #2 on: March 29, 2018, 12:57:57 PM »

In i1Profiler set for printer profiling choose the Lighting icon at the bottom, click on the Ambient Light down arrow, and select Measure.  Follow the instructions, I've attached a screen print of a household LED light example.

Richard Southworth
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DP

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Re: Measuring color temperature of a light source
« Reply #3 on: March 29, 2018, 01:38:10 PM »

I've use XRite's i1Profiler

or you can use Argyll spotread with i1Pro2 and get spectrum data in a text format that you can easily convert

https://argyllcms.com/doc/spotread.html
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #4 on: March 29, 2018, 03:21:14 PM »

or you can use Argyll spotread with i1Pro2 and get spectrum data in a text format that you can easily convert
https://argyllcms.com/doc/spotread.html
Since the OP has i1P, what advantage if any would he find using this instead?
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Andrew Rodney
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DP

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Re: Measuring color temperature of a light source
« Reply #5 on: March 29, 2018, 04:08:48 PM »

Since the OP has i1P, what advantage if any would he find using this instead?

not using closed source software - priceless.
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #6 on: March 29, 2018, 04:10:13 PM »

not using closed source software - priceless.
Ah, OK but the OP owns and uses that software. So there's NO other advantage and he can/should stick to what he's got no?
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Andrew Rodney
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DP

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Re: Measuring color temperature of a light source
« Reply #7 on: March 29, 2018, 04:28:21 PM »

Ah, OK but

OP will be able to decide for himself, our "job" is to tell him what's out there... 
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Doug Gray

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Re: Measuring color temperature of a light source
« Reply #8 on: March 29, 2018, 04:32:13 PM »

or you can use Argyll spotread with i1Pro2 and get spectrum data in a text format that you can easily convert

https://argyllcms.com/doc/spotread.html

The illuminant spectrum is also stored in text format (XML) by I1P. Just name and save it after you measure it.
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DP

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Re: Measuring color temperature of a light source
« Reply #9 on: March 29, 2018, 04:35:41 PM »

The illuminant spectrum is also stored in text format (XML) by I1P. Just name and save it after you measure it.

I'd rather convert .cxf to cgats

if this still works = http://www.jpereira.net/apps/cxf2cgats/
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Doug Gray

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Re: Measuring color temperature of a light source
« Reply #10 on: March 29, 2018, 04:40:07 PM »

I'd rather convert .cxf to cgats

if this still works = http://www.jpereira.net/apps/cxf2cgats/

I prefer CGATs for everything and conversions are easy enough. Especially as an illuminant file is so small. Two minutes and a text editor to CGATs, CSV, or whatever.
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DP

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Re: Measuring color temperature of a light source
« Reply #11 on: March 29, 2018, 04:43:47 PM »

Two minutes and a text editor

may be he has arthritis...
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #12 on: March 29, 2018, 04:47:45 PM »

OP will be able to decide for himself, our "job" is to tell him what's out there...
It's your job to tell him what advantage it is, to use a product he's never used before, that apparently has NO advantage in his task to build an illuminant specific profile. Apparently there's none. Which is why I asked YOU. If you want to get into the politics of software, fine. Ask the OP if he cares about your agenda OR, he simply want to use the product he has to get the job done.
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Andrew Rodney
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DP

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Re: Measuring color temperature of a light source
« Reply #13 on: March 29, 2018, 04:52:37 PM »

It's your job to tell him what advantage it is

already done : (A) open source donation ware (B) more "plainly formatted" text files





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DP

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Re: Measuring color temperature of a light source
« Reply #14 on: March 29, 2018, 04:53:50 PM »

Which is why I asked YOU.

ouch, Rodney goes CAPITAL... aching for a fight, huh  ;D
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #15 on: March 29, 2018, 04:59:14 PM »

already done : (A) open source donation ware (B) more "plainly formatted" text files
Utter rubbish! You’ve now made it clear there is zero advantage and a new unnecessary learning curve for the OP. What and why are you hijacking the thread and what are you selling?
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Andrew Rodney
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #16 on: March 29, 2018, 05:00:33 PM »

ouch, Rodney goes CAPITAL... aching for a fight, huh  ;D
Your arms are too short to box with dog!
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Andrew Rodney
Author “Color Management for Photographers"

Tim Lookingbill

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Re: Measuring color temperature of a light source
« Reply #17 on: March 29, 2018, 09:48:07 PM »

ouch, Rodney goes CAPITAL... aching for a fight, huh  ;D

Try LuLa's ignore feature. After what I've been through posting over the years here, it's like a thread diet. Takes feet, not inches, off my scrolling when threads go CAPITAL.

The "ignore" feature will allow "Show Me The Post" under that person's name if your curiosity gets the better of ya'.
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Two23

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Re: Measuring color temperature of a light source
« Reply #18 on: March 29, 2018, 09:53:15 PM »

How did this thread get so nasty so fast?  It started out about some esoteric color management, but will probably get closed. :o  Cue the funeral music:
https://www.youtube.com/watch?v=xt9SN7Y-z-A


Kent in SD
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digitaldog

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Re: Measuring color temperature of a light source
« Reply #19 on: March 29, 2018, 09:55:31 PM »

Try LuLa's ignore feature. After what I've been through posting over the years here, it's like a thread diet. Takes feet, not inches, off my scrolling when threads go CAPITAL.

The "ignore" feature will allow "Show Me The Post" under that person's name if your curiosity gets the better of ya'.
The ignorant is bliss!
Should we wonder if Tim’s post, like DP’s is intended to aid the OP (nope)or yet another agenda to hijack another post.
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Andrew Rodney
Author “Color Management for Photographers"
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