Graphic card dual lookups for spyder calibration

I am at present trying to calibrate dual dell monitors with spyder studio through a ge force 8500 card and I am having no sucess Datacolour have sent me a gamma test and as a result have informed me that my card will not support calibrated dual monitors
Can anyone tell me which graphic card will suport dual monitors calibrated seperatly to the same standard

I am not aware of any video cards with 2 LUTS. If you want to calibrate 2 monitors separately. you'll need 2 video cards. Then again, I don't think Windows supports discrete color management with 2 monitors (2 ICC profiles loaded) Someone else can answer the latter.

At some point I will be running 2 monitors, but not enough space at the moment.

bohdank wrote in post #11646974
I am not aware of any video cards with 2 LUTS. If you want to calibrate 2 monitors separately. you'll need 2 video cards. Then again, I don't think Windows supports discrete color management with 2 monitors (2 ICC profiles loaded) Someone else can answer the latter.

I've calibrated dual monitors under windows XP, Vista and 7 on a variety of different cards, all using different versions of the Spyder.

I was under the impression the spyder software managed the calibration to the point that it didn't use the LUT in the graphics card, so that having 2 did not matter.

But, for reference, I've had success using the Spyder Studio kit with an 8800GT and currently with a 5850. The 88000GT is now 4 or 5 generations old and very unavailable, and the 5850 has just been replaced by the 6870.

It either uses the video card LUT, or in cases where the monitor has it's own LUT and the software is able to access it, the monitor LUT.

I am not aware of any other way to apply a color "correction" to a monitor using color calibration software.

As to 2 monitors on 1 card, with 1 LUT... I can't see how this is possible.

Well I have two CRT monitors, connected over VGA cables (i.e analogue) that are both calibrated using a Spyder Pro.
This configuration started on an 8800GT and is now running on a 5850, all under Windows 7 (orginally on Vista).

Note, that if I calibrate using a Spyder express, only one monitor will display a calibrated profile.

There is some trick in the spyder pro software that allows you to have more than one monitor calibrated.

I wish someone could explain it to me. I've been googling for awhile and have not found a clear explanation on how that works.

bohdank wrote in post #11647774
I wish someone could explain it to me. I've been googling for awhile and have not found a clear explanation on how that works.

Ditto, I'm totally confused by it myself.
I know what happens, but I don't know why.

My best guess is the LUT can be held anywhere and the Spyder pro software simply builds it's own 2 tables that get fed to the graphics card and to Windows.


But, just to complicate things I run ATI's eyefinity as well, which works a bit like ultramon in that it turns 2 or more monitors into a single desk top space and runs them as if they were a single monitor.
Yet they both retain their individual calibrations.

I run dual calibrated screens (CRT and an LCD) on my G5, using a single ATI Radeon9600 pro. Which obviously has a dual LUT. Most modern cards do AFAIK.

Some links google found for "Dual lut videocard"

http://www.dl-c.com …s/2/11765.html?​1200545413
http://objectmix.com …rating-dual-monitors.html
http://forums.dpreview​.com …rum=1004&messag​e=28428956
http://forums.adobe.co​m/thread/484728

As I thought, 2 LUTS. Thanks.