Datacolor User to User Support Group.

Several possibilities. First: you simply cannot harness a racehorse  
and a donkey together and get a working team. A CRT is a much  
different animal from an LCD, and it's just not reasonable to try to  
pair them for precision work.

Next: the fact that both displays show a change in SpyderProof does  
not actually guarantee that both have unique calibration data being  
loaded to them, and both are using unique profiles (seperate items, by  
the way). The calibration could be great as you do each screen, but  
they may be overwriting one another if the card can't manage unique  
calibration data. Try adding another card.

Third: you don't note what process you are using to calibrate, or what  
target values are involved. If you are at an inappropriate luminance  
or inappropriate whitepoint for your lighting level, then the two  
displays may be affected differently by this, being different types of  
displays.

Whatever the cause, given the configuration you are trying to match,  
you may find it necessary to calibrate to two different whitepoints to  
get the effect you want.

C. D. Tobie
WW Product Technology Mngr.
Digital Imaging & Home Theater
DataColor.com
CDTobie@...

On Jan 19, 2009, at 9:00 AM, "str_online" <str_online@...> wrote:

> I have attached two monitors to one dual-head graphics card on Vista.
> Vista recognizes them both as "Generic Non-PnP Monitor - NVIDIA
> Geforce 7800 GTX". One of the displays is a 17'' Dell 1703 FPs LCD and
> the other is an old 21'' Nokia Multigraph 445X CRT.
>
> I have both calibrated and profiled these monitors using Spyder3. Then
> using Spyder3Pro software (Spyderproof) I have verified that the ICC
> profiles have been applied to their respective monitors. At least when
> I switch back and forth between "before calibration" and "after
> calibration" the looks of the screen changes on both devices (to
> better). A recalibration check tells that both screens are  
> calibrated ok.
>
> They should now look the same, right?
> No, they don't.
>
> I even matched their brightness by trial and error (adjust, calibrate,
> repeat until good). The CRT still has a yellow cast and the LCD has a
> blue cast. Or maybe it's neutral, but relatively the CRT is warmer. A
> lot. Then I thought that maybe the screens frame affects visual
> perception. I looked at the screens through a tube to exclude
> environmental effects. The CRT is warmer.
>
> Calibration (both monitors offer RGB adjustments that adjust color,
> somehow):
> LCD RGB=43%,43%,50% to produce pure white measured by Spyder.
> CRT RGB=56%,51%,46% measured. But if I change these *after*
> calibration and profiling to 45%,40%,52% then the screens look more  
> like.
>
> So... adjusting RGB on these screens makes white purer on both
> devices, but if I want identical colors I need to set similar
> %-values. Oops. Profiling is not supposed to work like this, so what's
> wrong?
>
> Any ideas would be much appreciated. Thanks.
>
>
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