Message
Re: [colorvision_group] Re: Matching dual monitors with Spyder2 Pro - homegrown solution
2006-03-15 by CDTobie@aol.com
In a message dated 3/14/06 10:16:39 PM, bernieg@... writes:
11. At the "Profile Chooser" window on the SECONDARY monitor, select
the correct profile for the secondary monitor. Now each monitor will
have the correct profile.
12. Close "Profile Chooser"
13. Steps 9 to 12 need to be done whenever you restart your computer,
but its easy.
The "corrections" you see when this process occurs has nothing to do with applying the second profile, but rather with flashing the video card curves (LUTs) from where the LUT data is stored in a special tag within the profile. Actual usage of the second profile would require that color managed applications such as Photoshop be able to access both profiles. So what you are getting is dual calibration, but not dual profiling. What almost everyone on Windows is getting is dual calibration, not dual profiling. Unless you are very fortunate in your combination of video card and driver, or use two cards or have a PCI express card, you are getting dual calibration but not dual profiling under Windows. But for some reason this thread has taken on a life of its own, and is attempting to create its own urban myth on the subject.
Here is how to check that your profile is actually changing, and that a second monitor profile is available to you under Windows:
Do everything you note in your post, but with Photoshop open, and an image on each screen in Photoshop. When you choose the new profile in Profile Chooser, look for a slight flash on that screen, as the video card's LUTs are flashed with curves from the newly selected profile. Thats change number one. Now click on the image that is open in Photoshop on that same screen, and look for a change in that image as Photoshop updates. No second change? Then no second profile is being applied... Try very different profiles to assure that you'll see something (but don't choose non-monitor profiles like sRGB, as they have no VLUT data, and can't cause that first flash).
C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com