Re: 5-6000 K
Re: 5-6000 K
- Subject: Re: 5-6000 K
- From: <email@hidden>
- Date: Fri, 02 Jun 2006 10:18:21 -0400
Scott,
I would not use a piece of paper as you suggest, unless I
am absolutely sure this paper is neutral. The brighter the
paper, the more likely this is because of Optical
Brighteners (OB), i.e. the increased brighteness comes
from UV absorption and fluorescence in the blue part of
the spectrum.
OB laden papers will significantly shift the perceived
color temperatute towards the high temperatures side
(blue).
I understand that users may want to use papers with OB
(which is often not appropriate for accurate color
reproduction, but this another issue), but here we are
talking of matching an environment, so the use of a
neutral paper is what I would recommend if a suitable
light-booth type white wall is not available.
You may be interested in the following paper I wrote on
how to easily identify UV-enhanced papers:
http://www.babelcolor.com/download/AN-2 How to identify UV-enhanced paper.pdf
Regards,
Danny Pascale
email@hidden
www.BabelColor.com
On Thu, 1 Jun 2006 10:09:18 -0500
Scott Martin <email@hidden> wrote:
Hmmmmmm . . . - sounds like theology to me. What if I
don't put any
proof in
the lightbox, but simply look at the neutral gray walls?
It still
takes
about 6000K from the monitor to get gray to match gray.
Since we are talking about a white point color
temperature it's appropriate to use a white piece of
paper. This is what I call the display calibration
litmus test. When a display is well calibrated it's
whites should match paper white in terms of color and
luminosity.
Of course, the distinctions between different
natural-white and bright-white papers becomes important
for the discerning user. Users that always print on one
type of paper can use it for this litmus test. Other
users should use a bright white piece of paper and either
tackle soft proofing to simulate paper white differences
or ignore these differences (which can fairly small).
In either case the Kelvin scale is pretty crude and
rarely provides the control necessary for an excellent
paper white match. Geeking around with the CIE x and y
coordinates can do the trick. Color Eyes Display gives
you the best control over paper white color with it's
manual white point adjustment tool. Anyone who is
frustrated with a poor paper white match should try
using this feature.
Scott Martin
www.on-sight.com
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