RE: Color Measurement
RE: Color Measurement
- Subject: RE: Color Measurement
- From: "Mike Eddington" <email@hidden>
- Date: Wed, 15 Jul 2009 11:12:57 -0400
- Thread-topic: Color Measurement
>>Dearest Mike,
My darling Roger, ;)
>>The Barbiery xy100 table has a calibration routine based on
>>BCRA tiles.
>>Never seen any instrument built like that. As long as I have
>>a set of traceable calibrated reflectance values for my
>>tiles, I can re-calibrate the instrument to my heart content
>>and always be assured of good repeatability.
>>It's like "Printer re-calibrate" in the GMG RIP, it always
>>bring the proofer back to the same standard. I don't think
>>it's a bad idea.
Neither do I. This is a great idea to ensure consistency from any one
device. I just don't think it directly addresses issues between
different makes and models on various surfaces/substrates, nor does it
appear that this is its intention.
>>
>>What the instrument then reads on substrates *other* than the
>>tiles is "part of the game". What is the alternative, in your opinion?
Other than using the same make and model (and rev level) I'm not sure
there is one yet. Perhaps a model of instrumental measurement
correlation or "normalization" as suggested here:
http://www.npes.org/pdf/WhitePaper.pdf, but I'm afraid my propeller
doesn't spin quite that fast this morning. Would it be feasable to have
corrections factors for instruments based on media? One would need a
reference instrument to align everything toward.
I'm more a realist on the issue, and I don't want to make a mountain
out of a mole hill, just to emphasize that using tight tolerances with
different instruments can lead to issues like the one that originated
this thread.
The way I see it, in dealing with tolerances and differeing measurement
devices (assumed to be within manufacturer's specs), as in the origial
post, there are only a few options without having to cause undue
cerebral stress.
1.Adjust your target baselines for the new device (as Jon Crook
suggested)
2.increase your tolerances to account for instrument differences, or
perhaps use dE2000
3.Re-calibrate the output device using the new measuring device. Likely
there won't be significant visual differences...probably...maybe.
4.ignor it
Robin's suggestion is a good one, and might certainly help the issue,
but I just don't think alignment to reference tiles will automatically
equate to alignment on differing surfaces/substrates.
Mike
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden