Re: View booth issues
Re: View booth issues
- Subject: Re: View booth issues
- From: "Mike Eddington" <email@hidden>
- Date: Sun, 21 Dec 2008 17:12:52 -0500
- Thread-topic: View booth issues
Correct Andy. I had it backwards...the i1's optical res is 10 nm and the sampling interval is 3.5 nm. Again, I agree that the i1 is not a device to provide unequivocal evidence of conformance to ISO 3664, but I still would argue that it has value to the end user.
-----Original Message-----
From: Andreas Kraushaar <email@hidden>
To: Mike Eddington
Sent: Sun Dec 21 16:21:21 2008
Subject: Re: View booth issues
don't confuse optical (bandpass) resolution and sampling resolution.
With a crappy optic you would smear a laser line really broad but you might sample this (bad) information with 1000 diode from 380 to 780 nm ....
Andy
On 21.12.2008, at 22:13, Mike Eddington wrote:
The i1 reports spectral data in 10 nm increments, but I understand that it actually measures a finer resolution than that (3.5 nm?). In any event, ISO 3664 also requires measurement over the range of 300-730 nm, which the i1 is incapable of doing.
So although a manufacturer could not qualify lighting system conformance toward ISO 3664 with an i1 spectrophotometer, it is still a useful too diagnostic tool for measuring spectral irradiance from 380-730 for Joe Lighting-Enthusiast.
Mike
-----Original Message-----
From: Andreas Kraushaar <email@hidden>
To: Roger Breton <email@hidden>
CC: Mike Eddington; ''colorsync-users?lists.apple.com' List' <email@hidden>; 'Roger Breton' <email@hidden>
Sent: Sun Dec 21 15:40:42 2008
Subject: Re: View booth issues
...
Using BabeColor CT&A's ISO-3664, I remember measuring something like 98 for
the CRI and a Grade B in the CIE012 test panel. Something I had never seen
myself in all the luminaires I measured with this software and my EyeOnePro
over the last four years.
ISO 3664 says (under 5.1 Spectral measurements):
The bandpass of the measuring instrument
(spectroradiometer) shall be 5 nm or narrower.
this rules out the EyeOne Pro (even if it very valuable in related issues such as process control)
regards
Andy
PS: There is a bunch of reasons why this is needed.
Also note that not all softproofing is done with a
viewing booth/hardcopy comparison.
But all softproofing at the press is to be done with a view booth/hardcopy
comparison, Mike.
The hardcopy happens to be that of the printing press. But granted, there
are empirical tweaks used by the monitor profilers to help improve the match
between the view booth/harcopy that probably go beyond calibrating to plain
D50. But, to the best of my knowledge, they don't necessarily use white
point deviations. I still have to digest Chris Edge article presented in
Portland's CIC.
My .02 canadian cents that are now worth less than your .02 us cents :(
Regards / Roger
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