Datacolor User to User Support Group.

The calibration is based on the center of the screen; it can't do  
anything about variations at other locations. Color tint difference  
between screens could well be caused by the big luminance difference  
(double!) of the two. And weak viewing angle range on LCDs is also  
beyond what calibration can control. So yes, one of the things using  
our products teaches people is the limitations of their screens...

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

On Jan 24, 2009, at 5:48 AM, "str_online" <str_online@...> wrote:

> After numerous adjustments and recalibrations ("learning"):
>
> In the middle of the screen, where Spyder measures,
> - my CRT is now at 6516 K 96 cd/m2 (max brightness and contrast)
> - my LCD is now at 6555 K 191 cd/m2 (contrast 62%, brightness 30%)
>
> The biggest difference was caused by brightness. Luminance really
> alters the perceived "color", even if the color temp is the same and
> monitors are calibrated. Is obvious to me, now.
>
> The CRT has a slightly warmer picture, detectable e.g. in skin tones.
> Actually, when I look at the greytone images in SpyderProof (or the
> grey background image) then I can see a slight magenta cast on the
> CRT. In many images it's pleasing. The LCD is greener.
>
> I also tried to calibrate the LCD to 5800K and 5000K (CRT at 6500K)
> but this just made the color balance (or whatever) less blue, more
> yellow. I could not match the magenta-green part. I wonder why...
>
> I seem to have a lot to learn :)
>
> ---------------------------------
> NOTES: The worst thing is that the amount of magenta varies by
> position on the CRT. In the middle it's slight, barely noticeable, but
> it's worse in other parts. And lets not forget geometrical distortion.
> And images cause horizontal magenta bands. The LCD on the other hand
> is even, but the shadows turn to black if the LCD is viewed at 0 deg.
> I need to tilt it to see shadow detail. Tilting then induces a color
> cast at the other end of the LCD. Using Spyder tought me to see that
> both my screens suck. I need a proper graphics monitor.
>
> --- In colorvision_group@yahoogroups.com, "Rollin" <rhill3@...> wrote:
>>
>> --- In colorvision_group@yahoogroups.com, "str_online" <str_online@>
>> wrote:
>>> I have two screens because I want to keep editors open in one and
>>> music player, email etc in the other. I only work with images on one
>>> screen at a time
>>
>> Until recently, I ran dual monitors off a dual headed Nvida card  
>> under
>> WinXP - one was a CRT and one a Dell FP.  There was no way that I  
>> ever
>> got the two to look the same but was able to calibrate them so that  
>> the
>> FP was at least reasonable and the CRT was calibrated.  This worked
>> fine as I put the primary Photoshop screen on the CRT and placed all
>> the tool pallets, histograms,etc. on the LCD. This worked both under
>> Spyder2 and Spyder3. As an aside, the Dell LCD always looked brighter
>> and contrastier no matter what I tried to do to it than the CRT BUT  
>> the
>> CRT matched the prints (using softproof).
>>
>> The CRT died and I replaced it with an Eizo monitor that I can
>> calibrate and the Dell still looks different even when they show as
>> very close in Kelvin temperature.  The Dell is just too bright and
>> there is no contrast control so just cannot fine tune it.  Again, it
>> works as the second monitor.
>>
>> I tried Lightroom but have gone back to just PS for my needs at this
>> point.  I believe that LR now supports dual monitors so you can do  
>> the
>> same thing under it - one monitor for the image and one for the  
>> editing
>> tools.
>>
>> Rollin
>>
>
>
>
> ------------------------------------
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