Re: View booth issues
Re: View booth issues
- Subject: Re: View booth issues
- From: Don Hutcheson <email@hidden>
- Date: Thu, 18 Dec 2008 18:34:04 -0500
Jim,
I've
checked both viewing units with Ugra and Rhem Light indicators and
they
check out okay.
1. Contrary to false claims by GATF, the Rhem indicator does NOT tell
if a viewing booth is D50, nor does it absolve it from metamerism
failure. At most it is a useful toy for demonstrating the concept of
metamerism. I never use these indicators myself, as I've found dozens
of BAD booths that PASSED the Rhem test. Maybe hundreds.
Is there a way to take a light reading
of the light in a booth and then apply it to a profile so I can get
a better
match between our master view booth and the monitor?
2. Yes, you can measure the light spectrum of any illuminant and make
spectral-based profile of the printer or proofer. The easiest way is
to measure the viewing booth with an Eye-One Pro (rev B or later) in
Eye-One Share software, export that spectrum to ProfileMeker and
select it as the source instead of D50 when building the profile. You
will have to save the printed target data in spectral units, not CIELab.
Selecting that profile in Photoshop should hopefully solve any color
issues due to metamerism failure or a poor color rendering index (CRI)
which often shows up as hot pink Caucasian skin tones on the monitor
compared to the proof.
However your problem may be due to a different problem - specifically
the common error of calibrating the monitor to D50 instead of to the
actual white point of your viewing booth.
Simply selecting "D50" as a white point when profiling a monitor is
not going to work if you plan on comparing the monitor to an adjacent
"D50" viewing booth. The reasons are too complicated to go into here,
but trust me when I tell you that the only way to get your monitor's
white point to match a given viewing booth - especially when both are
viewed simultaneously from one seat - is to measure the white point of
the booth (ideally in Yxy) and plug the "little x" and "little y"
values into the software instead of a D number or Kelvin number.
This feature is easiest to accomplish in two monitor profiling
packages - MonacoOPTIX Pro (if you can find it) and ColorEyes
Display. Even having done this you may still need to tweak your
monitor calibration curves slightly to get the best possible grayscale
match, but it's worth the effort for critical work.
Don
........................................................
Don Hutcheson
HutchColor, LLC
Washington, NJ 07882, USA
office: (908) 689 7403
cell: (908) 500 0341
........................................................
On 12/18/08, at 15:07, email@hidden wrote:
From: Jim Mitchell <email@hidden>
Subject: View Booth Issues
To: <email@hidden>
Message-ID: <C56FFA79.1060%email@hidden>
Content-Type: text/plain; charset="US-ASCII"
I just got a new Eizo monitor. The monitor agrees pretty good with an
Approval proof setting in the desk top view booth beside it. However
when we
take the Approval proof to our master view booth, where all color is
evaluated, it seems to have a slight green cast in the neutrals.
What might be going on or is it a color memory issue?
Which brings me to my next question. Is there a way to take a light
reading
of the light in a booth and then apply it to a profile so I can get
a better
match between our master view booth and the monitor?
Jim Mitchell
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