Datacolor User to User Support Group.

"Or, add a PCI Express videocard, those appear to work in virtually 
all cases for dual monitor calibration.
"

I have the ATI Radeon X600, which is PCI Express.  Unless Dell has a 
custom crippled version.  Does that change anything?

Del

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:
>
> 
> In a message dated 4/14/07 1:30:19 PM, delk1945@... writes:
> 
> 
> > When I calibrate the Dell with Spyder2PRO, there is visible 
change in
> > the screen appearance.  If I move from 6500 K to 5800 K, the 
screen
> > appears warmer.  When I check the effect of calibration at the 
end of
> > the process, there is visible change.  Neither of these are true 
with
> > the HP.
> > 
> This would indicate that your videocard does not hold discreet sets 
of video 
> corrections (VLUTs) for both monitor outputs. Its not uncommon 
under Windows 
> for this to happen, or for the dual-head videocard to fail to be 
seen as two 
> devices by Windows, which will cause you to be unable to assign 
distinct 
> profiles. Either case will mean a failure to obtain full and 
distinct color 
> management on both monitors. Two possible solutions: add a low cost 
second videocard, 
> and run the second monitor from that. Or, add a PCI Express 
videocard, those 
> appear to work in virtually all cases for dual monitor calibration.
> 
> >   In several trials I have, perhaps by chance and by choosing
> > different starting points, gotten desktop colors that are similar
> > (not perfect, but close).  However, upon rebooting this similarity
> > goes away.
> > 
> That would be the VLUTs getting loaded (or not getting loaded...) 
at that 
> point.
> 
> >   When I open Photoshop and open a photo in display 2 and
> > move it to display 1, colors change visibly.
> > 
> That could be from incorrect VLUTs on one of the displays, or an 
incorrect 
> profile on one display, or both; no way to tell from that 
description.
> > 
> > While I intend to use the HP for photo editing, I would like for
> > there to be some rough consistency between the two.  I don't 
believe
> > this should be impossible.  I fear that I have overlooked 
something
> > obvious, but can't put my finger on it.  Any help out there?
> > 
> > I assume I have described your "something obvious" above, though 
few people 
> greet the news that they need to purchase another card, and find 
room for it, 
> with pleasure...
> 
> Another possibility is that upgrading to Vista MIGHT fix the issue, 
but the 
> likelihood of Vista not supporting your current videocard at all, 
or not 
> supporting it for advanced usage, is perhaps more likely that it 
being a fix. And 
> there is always the possibility of other incompatibilities or 
> unavailable/reduced function drivers in the bargain.
> 
> C. David Tobie
> Product Technology Manager
> ColorVision Business Division
> DataColor Inc.
> CDTobie@...
> www.colorvision.com
> 
> 
> 
> 
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