Luminous Landscape Forum
Raw & Post Processing, Printing => Colour Management => Topic started by: rxchaos on March 29, 2018, 12:32:16 pm
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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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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 (http://digitaldog.net/files/22Thecolorofwhite.pdf)
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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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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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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 (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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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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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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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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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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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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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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Two minutes and a text editor
may be he has arthritis...
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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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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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Which is why I asked YOU.
ouch, Rodney goes CAPITAL... aching for a fight, huh ;D
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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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ouch, Rodney goes CAPITAL... aching for a fight, huh ;D
Your arms are too short to box with dog!
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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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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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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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How did this thread get so nasty so fast?
Trolls not here to aid the OP. The paper trail is kind of obvious!
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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
It's not going to get closed. I can assure you. Don't worry about it. Use the information provided and move on. Myself and from what I've seen from others posting have moved on as well.
Andrew Rodney does provide good information and he is knowledgeable in this field, but he does get over zealous when others offer "see something, say something" information or what I call knowledge derived from practical application. Some of us don't like get into color science theory because none of us including Andrew are color scientists. We're all looking for practical application of this technology. Not interested in the politics on which company is the best at applying this technology because there's no way to prove any of it to apply to our workflow.
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It's not going to get closed. I can assure you. Don't worry about it
Once again, the master of assumption.
You now a moderator here Tim?
Some of us don't like get into color science theory because none of us including Andrew are color scientists.
Some of us here are actual photographers and understand color science without being color scientists. Some are not; they enter posts without having much understanding of a topic, with an agenda to troll and without any regard to the OP, on a topic about products these people don't understand. Or perhaps even own!
Tim, stating the benefits of the Ignore button will likely continue; it is rude to silence a fool, and cruelty to let him go on.
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Better get used to reading that kind of input from Andrew by others who post what he doesn't like or agree with. It's a big time waster which is why I'm not going to post in this thread any more.
You could just PM Andrew and you can have him help you on a personal basis?
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Better get used to reading that kind of input from Andrew by others who post what he doesn't like or agree with. It's a big time waster which is why I'm not going to post in this thread any more.
You could just PM Andrew and you can have him help you on a personal basis?
Either someone here can’t figure out how the ignore button actually works or his “advice” to others, OT as well, is again misinformed.
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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
Thank you. That was easy. I just wanted to be able generate the icc profile using the settings specific for my lightsource.
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Thank you. That was easy. I just wanted to be able generate the icc profile using the settings specific for my lightsource.
Make sure you save it after measuring. Then you can just select it from the pulldown custom illuminant menu when you make new profiles for the GTI. No need to measure each time.
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rxchaos,
Don't be surprised if you get some strange results profiling with "spiky" illuminants such as the one I used in the example. I tried it with one of my measurement sets - first had a program crash, on the second try the profile generation completed, but using the profile in softproofing revealed ugly color artifacts. I suspect a relatively smooth illuminant spectrum is required for useful output.
Richard Southworth
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Make sure you save it after measuring. Then you can just select it from the pulldown custom illuminant menu when you make new profiles for the GTI. No need to measure each time.
Or just drag and drop the ICC profile onto the Lighting Workflow. It, like nearly all settings in all workflows are saved within the profile and can be extracted by drag and drop.
Maybe DP can tell us if the same is true of the product he recommends.
Of course, you want this check box ON:
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rxchaos,
Don't be surprised if you get some strange results profiling with "spiky" illuminants such as the one I used in the example. I tried it with one of my measurement sets - first had a program crash, on the second try the profile generation completed, but using the profile in softproofing revealed ugly color artifacts. I suspect a relatively smooth illuminant spectrum is required for useful output.
Richard Southworth
I've posted before some of the strange, profile artifacts I1P sometimes produces. Especially in Perc. Intent. And this was with the default, D50. I've also had program crashes when using other illuminants, not just measured ones. In the case of measured ones I wound up tweaking small values in near insignificant portions of the spectrum. Small amounts that would make no more than .1 dE difference anywhere and was able to get it to work.
From this I suspect I1P has a problem with ill conditioned matrixes causing crashes or bad numerical results. It's not often but it happens every now and then. There are more robust analytic processes but they tend to be slower.