Message
Re: [colorvision_group] Color matching monitors -- target "white point"
2007-05-18 by CDTobie@aol.com
In a message dated 5/17/07 11:29:57 PM, bbass408@... writes:
I've read some posts where people have trouble color matching two
monitors and they mention getting a "white point" setting from the
calibration of one monitor and using that as a "starting point" for
calibration of the second monitor.
Could someone please explain this further.
There are two technical terms that get confused. Whitepoint and White Luminance. You need to match both. Whitepoint is the color of white. If you can match this with RGB gains controls, thats ideal, as its a hardware match,with no software cost. If not, we match your monitor's whitepoint to the target whitepoint for you, via the videocard corrections. That will get you two monitors that show the same color of white on screen. That value will be something like 6500k, or perhaps you'd use a custom value you feel better matching your paper white in your proofing light, such as 5800k.
Next is white luminance. This means the brightness of white (and of everything else, which all tags along) on the monitor. Again, you need to match this on two monitors for them to match. This means finding a white luminance both can hit (and thats appropriate for your ambient and proofing lighting) and targeting that for both monitors. So you need Spyder2PRO, which allows white and black luminance targets. Go to the Info window from the menu bar in Spyder2PRO, and check the native white luminance of both monitors. Use a value at least a bit lower than either native white, for headroom on the dimmer monitor (you don't want to set a target you can't hit again next month, when the monitor dims a bit), unless you are using a value thats notably lower than both, to match your ambient or proofing light brightness.
C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com
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