I am interested in getting a second LCD panel for my PC which has a AGP dualhead (RGB and DVI) video card, and since I calibrate my LCD panel with Spyder2, I decided to write to ColorVision for clarification. This is what I get:
Originally Posted by Witness
"Unfortunately, the Windows operating systems do not support duel monitor calibration utilizing a duelhead video cards unless the card has two LUT's, other wise "two separate cards are required". This is an issue with the Windows OS. It is not created by the ColorVision applications.So, it looks like only PCI-e video cards or two separate cards are required to produce different monitor profiles simultaneously.
It is a general problem for all monitor calibration products and is discussed in the support areas of all major vendors in this arena.
Only "Spyder2Pro" has the features to support multiple monitor calibration.
Using PCI Express video cards eliminates the trouble with dual-head cards regarding profile association on Windows.
Using Spyder2PRO on Windows (XP/2K) to calibrate and profile two monitors attached to one dual-head video card can be troublesome. The usual issue is that regardless of whether you use Display Properties->
Settings-> Advanced-> Color Management -or- Profile Chooser, Windows
always assigns the SAME monitor profile to BOTH monitors.
When this happens, the solution is to use a separate video card for each monitor.
This situation appears to be changing with the release of PCI Express video cards. There are now three types of connections for video cards:
* PCI Express
User reports and internal testing indicates that with many, if not all, video cards using the PCI Express technology, Windows is correctly allowing the assignment of DIFFERENT monitor profiles to monitors attached to dual-head PCI Express video cards.
I have personally tested dual-head configurations (two monitors attached to one video card) with:
* ATI x600
* Matrox Parhelia
and found that Windows works correctly to assign DIFFERENT monitor profiles to each monitor.
Additionally, we have a user report that this also works correctly with:
* ATI x1300
Of course, this has never been a problem with the Macintosh. Dual-head cards have always worked correctly on the Mac and continue to do so with the advent of PCI Express video cards in Macintosh machines.
ColorVision Customer Support - USA"