Re: Light box screen match
Re: Light box screen match
- Subject: Re: Light box screen match
- From: "john castronovo" <email@hidden>
- Date: Tue, 19 Jun 2007 23:10:21 -0400
One should be careful not to either completely mask off the transparency
with black or surround it entirely with white.
Rather, most of the white of the light box should be masked off to
black, but about 5 percent of the transparency area should remain as
white around the transparency. This white border has the effect of
keeping some of the white of the box as a reference for the eye to judge
the brightness of the chrome by. Entirely masked off, the eye will
adjust and the chrome will look brighter than it really is. We also dim
the box so that it matches the white of our monitor as closely as
possible. Then when we view the digital file, we also put a small white
border around it for the same reason as for the viewing booth.
Before profiling to native white, we adjust the monitor's white point to
match the light box which is lit with GTI 5000k lamps. We keep the
ambient room lighting very low and close to 5000k and we use DonRGB for
our default color space which also has a 5000k white point. This setup
has worked extremely well for us in the critically matching fine art
reproductions to transparencies, so I see no reason to do otherwise.
john castronovo
tech photo & imaging
fairfield, nj
----- Original Message -----
From: "Jack Bingham" >
I beleive some trickery might be required to make this work. First
while the Karl Koch philosophy would have you view the transparency on
a lightbox surrounded by white, I don't think you can get past all
that transmitted white with your eyes to get a reasonable impression
of the transparency. So I would start with a black mask around the
transparency. Next rather than do this visually i would pull out the
photographic spot meter and use it to measure a midtone on the monitor
image and the same tone on the transparency. I just did a quick test
and got what I would consider a pretty close match. My monitor is at
120 and my booth is at about 75-80%
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