Re: Solux Colorproof Kits
Re: Solux Colorproof Kits
- Subject: Re: Solux Colorproof Kits
- From: "dpascale" <email@hidden>
- Date: Mon, 21 Jan 2008 11:52:12 -0500
Hello Kevin,
Some answers can be found in ISO 3664 and ISO 12646.
In ISO 3664 you have two specified viewing conditions:
(P1) Critical comparison of PRINTS: D50, 2000 lux
(P2) Practical appraisal of PRINTS: D50, 500 lux
which should have a general CRI, as measured as per CIE 13,larger or equal
to 90, and individual CRI indices larger or equal to 80.
Also, their Metamerism Index, as measured as per CIE 51, should be "C" or
better.
In ISO 12646 you will find chromaticity (D50 plus or minus 0,010 u'v'),
uniformity, and Luminance requirements for your monitor. Because these
standard were written in the CRT era, the specified Luminance is on the low
side (i.e. should be larger than 75 cd/m2, ideally 100 cd/m2). The tendency
is to look for a Luminance of about 140 cd/m2, if only because it can be
difficult to set many LCD displays at lower Luminances.
For more details on the requirements, you can have a look at the
"Spectral tools description/ISO 3664+ tools description"
section of this document:
http://www.babelcolor.com/download/BabelColor_CT&A_Help.pdf
In this document you will also see descriptions of how to do these
measurements with an Eye-One Pro.
The monitor/artwork Luminance matching is usually done by changing the
light-booth level in order to have equivalent monitor and artwork
brightnesses.
IMPORTANT:
1- Because you are using Solux lamps, you cannot simply change the lamp
voltage to change the light level, since this will also affect the color
temperature.
2- The monitor and lamp color temperature should be the same when comparing
side by side. This means that your Solux should be boosted to 5000 K (with a
much shorter life-time, or that your monitor should be calibrated to 4600 K.
4600 K is quite yellowish for day to day use, but many have adapted to D50,
so 4600 K should be possible!
3- Using a diffuser is OK in principle. In practice, a diffuser will very
likely (it does!) affect the color temperature also. For example, it will
lower it if it is even lightly yellow. If you can find a diffuser that
increases the color temperature, then Point-2 could also be solved.
4- Be careful if you illuminate the original art with the Illuminance levels
of P1 and P2, shown above, for a long time. This could permanently affect
the artwork pigments.
Regards,
Danny Pascale
www.babelcolor.com
----- Original Message -----
From: "Kevin Muldoon" <email@hidden>
To: "colorsync-users" <email@hidden>
Sent: Monday, January 21, 2008 9:45 AM
Subject: Solux Colorproof Kits
About a year ago, I purchased two 4600K Solux Colorproof Kits and have
been very happy with results. I see many references on this list
regarding temperature & lumins of monitors but I wonder if there is a
standard amount of light one should achieve when illuminating artwork,
specifically when creating a proofing environment and color correcting on
a monitor.
I am planning to buy a set of diffusers to even out my lights (obviously,
lowering the intensity of my lights) and wanted to know if there was a
better standard than "Looks good to me". Thanks!
--
Kevin Muldoon, Owner
TrueBlueDot - Fine Art Printing
New Haven, CT 06511
email@hidden
www.truebluedot.com
"Our pigment meets your imagination"
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