Re: native white point
Re: native white point
- Subject: Re: native white point
- From: Chris Mahn <email@hidden>
- Date: Wed, 24 Nov 2004 11:26:07 -0800
This is a very timely discussion for me!
I just received my Eye-One Photo package & am calibrating my 17" Apple
Studio Display (lcd) using eye-one pro spectro & eye-one match 3.01.
From what I gather, the white point for an lcd display should be
"native" or "6000-6500K".
Using eye-one match, I get a native white point of ~5300K for my
display. If I calibrate to 6000K it is quite cool, but 6500K is too
cool for me!
Is there any benefit to working with my monitor calibrated to 5300K or
6000K temp?
Also...
I decided to make some white point measurements using just modification
through the ColorSync control panel (ColorLab kept crashing so I used
PM 4.1.5 in demo mode). Now there is a slider, where you can select the
white point. When I clicked on "use native white point" the slider
jumped to D65 (6507K). However, measuring a white patch under this
setting tells me the the white point is actually ~5300K (the same
number that eye-one match gave) and NOT 6500K like it claims. And to
get a 6000K white point, I have to move the slider to 8000K!!! Does
this sound strange to anybody?
Cheers.
--------------
On Nov 22, 2004, at 7:59 AM, Mike Eddington wrote:
What software are you using to create your monitor profile? Most new
software packages for monitor profiling now allow you to select native
white point when creating profiles, but some older versions don't.
Monaco Profiler 4.6 and GretagMacBeth ProfileMaker 4.0 did not offer
this as an option.
Here's one possible way you can measure white point...I'm sure the
pro's will chime in if there is an error in my methodology:
1. Download ColorLab from
http://www.gretagmacbeth.com/index/products/products_color-mgmt-spec/
products_professional-cm/products_pm5-publish/products_pm5-
publish_sw.htm
2. Use the Spot Measure feature in Logo Color Lab to measure a white
patch on your monitor
3. Display the results in XYZ
4. Go to www.bruclindbloom.com, click on the Calc button and select
the CIE Color Calculator
5. Enter you XYZ values in the appropriate fields and click the XYZ
button to display the Color Temp
The above assumes your spectrophotometer is supported by ColorLab and
can work in emissive mode.
In my case, a white patch on my Eizo CG21 monitor gave XYZ readings of
129.4, 135.3, 140.7, which calculates to a white point of 6136.1 k.
mike
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