Datacolor User to User Support Group.

With windows 7 and the right settings (see http://www.laszlopusztai.net/2009/08/23/stop-losing-display-calibration-with-windows-7/), the calibration data of the profile can actually be flashed to the videocard when defaulting a certain profile. I used this in the workaround to measure the calibrated tone response curves with the advanced analysis.

After a whole weekend of trying many different things and also installing other software to calibrate/profile I ended up profiling manually with a luminance meter and had to find out that the photo mode of the P23T-6 LED IPS display seems to have ACR on, even though the manual and the OSD say otherwise ... No wonder the calibration did not go right.

Thanks for your time.
Gerard


--- In datacolor_group@yahoogroups.com, CDTobie  wrote:
>
> >>I wasn't quite clear with the workaround explanation. I actually do change the profile of the second display (the one I calibrated) and not the first display. I just mentioned that I do this on the first display to note that I am not switching applications on a single monitor.
> 
> Still, applying a profile under Windows at the OS level will not flash the video calibration data to the Video LUTs, as it will on a Mac. So the idea that this will allow you to measure the "calibrated' state would be incorrect, not to mention that our current software would remove the LUT corrections before measuring anyways, as that is the way it was designed. 
> 
> >>So I am still confused why the calibration did not go right. I also tried making a profile only and based on this trying to set certain luminance values on the screen, measured with a Minolta luminance meter, and these did not give the correct tone response curve either.
> 
> Why would a profile built to just define the current state of the display, not calibrate it, reduce a correct tone response curve? You told it not to. 
> 
> >> Is there a reason why the hardware tone response curve as shown in the file 'before_calibration.jpg' in the photos section is too difficult to calibrate or create a good profile of that can be used in a CMS?
> 
> I don't quite understand the question. Correcting the TRC, per channel, is a calibration function. Not a profile function. Where the "too difficult" part comes in is not clear to me.
> 
> C. David Tobie
> Global Product Technology Manager
> Imaging Color Solutions
> Datacolor inc. 
> cdtobie@...
> www.datacolor.com
> 
> On Jan 5, 2013, at 6:07 PM, "gerard_culemborg"  wrote:
> 
> > I wasn't quite clear with the workaround explanation. I actually do change the profile of the second display (the one I calibrated) and not the first display. I just mentioned that I do this on the first display to note that I am not switching applications on a single monitor.
> > 
> > So I am still confused why the calibration did not go right. I also tried making a profile only and based on this trying to set certain luminance values on the screen, measured with a Minolta luminance meter, and these did not give the correct tone response curve either. Is there a reason why the hardware tone response curve as shown in the file 'before_calibration.jpg' in the photos section is too difficult to calibrate or create a good profile of that can be used in a CMS?
>