Re: Press Room Lighting
Re: Press Room Lighting
- Subject: Re: Press Room Lighting
- From: <email@hidden>
- Date: Sun, 22 Jan 2006 11:07:35 -0500
Scott,
As you saw, even with booths which match standards, you
will see differences in perceived colors. Roger Breton and
I have done a similar comparison with Just/GMB/GTI/Solux
tubes and lamps. You can find the results in this pdf:
http://www.babelcolor.com/download/Light_under_control_2005-11-08.pdf
from this page:
http://www.babelcolor.com/main_level/Tutorials.htm
The tubes are all judicious mixes of phosphors with a
spectral response that intend to match the ideal D50. But
their spectral response is "wavy", going below and over
(crossing) the theoretical D50 response at many
wavelengths; this creates metameric mismatches for some
colors and for some ink+media combinations. With all the
media and booths you have, you are in for a headache, and
you attempt to standardize is in the good direction.
As for which "tube" is better.... it depends on your
personal taste (even if we are in a "rigorous"
standardized world, since there is still some margin in
the standards), your customer preferences/equipment, and
money.
I have not tested the new Just proGraphic tubes, but the
simple fact that they are advertised as "new" and "pro"
"may" mean that they are have a better QUALITY GRADE (as
per CIE S 012 or CIE 51) and a great CRI to go with (CIE
13.3) than other models from the same (and other) company.
At least this is what I would expect.
Please keep us informed if you test the new tubes. Maybe
Roger Breton will buy a few also.... ;-)
As for you color matching of the ColorChecker under D65
for your viewing area, the result should be good since the
chart colors, and especially the greys, which I suppose
you were referring to, are not too susceptible to
metameric effects.
Danny Pascale
email@hidden
www.BabelColor.com
On Sun, 22 Jan 2006 08:12:34 -0600
Scott Campbell <email@hidden> wrote:
Howdy yawl,
I've spent the last week wrestling with a variety of
proofing light sources over our consoles in our press
room(needs updating badly). I've got several GTI booths,
Just's, and some "custom" made fixtures with Phillips
bulbs. With input from my pressmen, I'm attempting to
standardize all of them. Our plant internally generates
Canon and Epson ink jet proofs. We get a variety of
other proofs(Fuji finals, Matchprints, color Lazers,
ect. . .) from the multitude of customers we have. We
have several web presses, and we generally print on
lightweight No 5 papers. I seem to have the best real
world luck using the Just bulbs. I noticed a new brand
of bulb on Just's Website called Daylight 5000
ProGraphic. Anybody using these? Know of any
deficiencies? I'll probably buy a couple of them to
test.
I'm brainstorming before I send the purchase request to
the CEO.
One other related item, while having the paint for the
viewing area custom mixed at my Sherwin Williams paint
store, I made them re- calibrate their spectro before
reading my Macbeth Color Checker swatch. The store
manager was nice enough to let me see their software,
and I was able to select a light-source for the
particular mix of the paint. It was set on
"incandescent", and I had them switch it to D65. The
only other choice was a generic "florescent." Anyway, I
pretty happy with the match.
Thanks in advance for any input,
Scott Campbell
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