Datacolor User to User Support Group.

Thank you Lauri, I appreciate your help as much as David's.



--- In datacolor_group@yahoogroups.com, "Laurie Solomon" <ls1000@...> wrote:
>
> Again I am not David; but I will venture to add my two cents. (smile)  My understanding is that the ‘studio match” feature only works if the two monitors are identically and exactly the same brand, model, age, and located in the same location next to each other at the same angle to the viewer and ambient light sources such that one calibration and profile fits both; otherwise it is best to calibrate and profile each separately.
> 
> As for the earlier issues and answers, I view calibration and profiling as two separate and distinct operations, although they may be performed by the same program during the same session.  The former “physically” sets the monitor as a device to a given base line standard in terms of brightness and contrast levels, color temperature, among other factors; this is a global setting (and should be the same or similar for all the monitors in a specific location under particular conditions that one is going to profile.  The second, color profiling, is device dependent in that it comprises a characterization of a monitor’s color space in light of that monitor’s calibration standardization, defining the monitors operative color gamut and how various color values will be rendered within that color gamut; color profiles are not global but are device specific and even temporally specific in that they may change over time as the monitor ages or warms up.  Thus two monitors may have identical calibrations but different color profiles.
> 
> If my description of the differences between calibration and profiling are in error, I am sure that C David will correct me; but I think that I am generally correct.  I must admit that my understandings may now be out of date with the changes from CRTs to flat screen LCDs and other even newer types of monitors and with the newer profiling devices and programs that often perform both functions at the same time.
> 
> 
> 
> From: patop_p 
> Sent: Sunday, August 07, 2011 11:15 AM
> To: datacolor_group@yahoogroups.com 
> Subject: [datacolor_group] Re: Double profile?
> 
>   
> I'm sorry David I forgot to ask something on the previous message.
> 
> What the difference between calibrating each display separately and doing the studio match feature of the software?
> 
> Thanks
> 
> --- In mailto:datacolor_group%40yahoogroups.com, Cdtobie <CDTobie@> wrote:
> >
> > Certainly all of Laurie's comments are correct. In addition it's worth noting that the OS listing the profile is normal, and having the color not change if you trash the profile is normal as well (Windows is full of virtualization, and the copy of the profile you can delete is not really the data that the OS is using). Another factor is the difference between the profile, which is applied only by color managed apps, and the calibration data, which is globally applied to what you see on the display in any and all apps. The flash to different color when moving an image to another display is likely to be the app applying the profile, rather than graphics core corrections to the pixel values for the new screen. One further factor is your graphics card: if it can only hold one set of LUT corrections, and applies them to both displays, it will be wrong for one of them. If you have two cards, this should not happen.
> > 
> > I suspect this info won't automatically solve your issue, but it's a start to determining where it lies. 
> > 
> > C. David Tobie
> > Global Product Technology Manager
> > Imaging Color Solutions
> > Datacolor inc. 
> > cdtobie@
> > www.datacolor.com
> > 
> > On Aug 6, 2011, at 10:34 PM, "Laurie Solomon" <ls1000@> wrote:
> > 
> > > 
> > > 
> > > With respect to the first issue, it is normal that the Windows color management module’s control will be overridden by the Spyder software. 
> > > 
> > > With respect to the second issue, others may have a more detailed and accurate explanation for all the elements of your issue; but I would suggest to you that, when you view an image from within a color managed or color management supporting application, the colors you see cannot guaranteed with any reliability to be the same when that image is viewed in a non-color managed or color management supported viewer or program. Since the non-color managed viewer or program does not use or know how to use color profiles in rendering the image, it often will assume some default color space like sRGB to render images regardless of the image files tagged color profile which will result in a different rendering rendering of the colors and color values from that which a color managed viewer or program would produce; but it is not necessarily the case that the assumed default non-color managed viewer or program will assume any standardized color space profile â€" let alone sRGB. If it assumes some other working color space such as Adobe RGB 1998 or a proprietary version of sRGB, even an imported jpg file with sRGB settings could be rendered differently than it was in the original viewer or program.
> > > 
> > > I have no answer to why the Lightroom window is not rendered similarly in the two calibrated and profiled monitor displays when it is moved from one monitor to the other or why it would “flip” after a second or two duration. Are you saying that the window display in the first few seconds of its being moved looks the same one the second monitor as it does on the first but then after a few seconds changes color; or are you saying that the image in the Lightroom window changes colors when the window is moved? If it is the latter, then it would appear that the Lightroom program uses the monitor color profile of the primary monitor or the first monitor that it is opened up in during a session as its operative color profile for the images in its window; and moving the window to a second monitor display which may be characterized by a slightly different color profile will result the image being rendered in accordance with a color profile that is not the one that it is tagged with even though the Lightroom window per se may be rendered correctly using the new color profile.
> > > 
> > > From: patop_p
> > > Sent: Saturday, August 06, 2011 7:18 PM
> > > To: mailto:datacolor_group%40yahoogroups.com
> > > Subject: [datacolor_group] Double profile?
> > > 
> > > Hi people, please can someone help me with this issue.
> > > 
> > > I have a Spyder 3 Elite, a Dell 3008 display and a Dell 2404 display (as secondary). I calibrated each one with the Spyder 3 Elite software. After calibrating I can see on the color management app in my control panel (using Windows 7) that both displays have an ICC profile associated with the name I gave them on the Spyder software.
> > > 
> > > The fisrt issue is that if I delete those profiles nothing happens, the colors on my screen remain the same, but if I turn calibration on and off on the system tray icon for spyder utility then the colors do change. So it seems that Utility is controlling the color managemente overriding the windows control panel app. Is this normal?
> > > 
> > > The main issue I have is using Adobe Lightroom when color correcting any picture, after getting the skin tones to where I like them I export a JPG and if I open it on a standard viewer (not color managed) the skin tones look different even exporting the JPG with sRGB settings. When I open it on photoshop the colors are the same that my raw file in Lightroom. The weird thing is that the JPG when I move it from one display to the other remains the almost the same (because of the calibration), but if I move the Lightroom window from one display to the other after about one second the colors flip, looking totally different (a lot more red) THAN THE SAME FILE on the other screen. That drives me crazy because that makes useless the secondary display feature of Lightroom.
> > > 
> > > Please help me with this. The only thing I can figure is that the OS (or the spyder utlitity) is loading the ICC profile once and then Lightroom does it another time, because the exported JPG then looks reddish on almost every screen I tested and even on paper (printed on several labs).
> > > 
> > > Thank you.
> > > 
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