Dear Graeme, Thank you very much for your detailed reply. I appreciate your time. Good news - I found a lab at work willing to lend me an i1Pro. I'll order the monitor now that I have a plan to calibrate it. I can calibrate it once with the i1Pro, and also create a colorimeter correction for my specific i1D2. Then I can calibrate it with the i1D2 and compare the result with the first calibration to confirm the accuracy of the new correction file. This seems to offer a good chance of success. Best regards, Al -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: Wednesday, September 4, 2013 10:51 PM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Calibrator correction for Eye One Display 2 & GB-LED Backlight LCD Monitor? Al Robertson wrote: Hi, > The NEC has become dim over time and I'm looking to replace it soon > with an Asus ProArt PA249Q which, like the better known Dell U2413, > has the LG > LM240WU9-SLA1 AH-IPS panel. But I have one problem. > This relatively new panel has a GB-LED backlight (improved gamut), but > from what I've read, the curves are sufficiently different that I > would need to either go buy a new calibrator (X-Rite wanted to sell me > the i1Display Pro - $229), or get a new correction matrix to > successfully use my existing colorimeter. The i1Display Pro is a pretty solid instrument, and well worth the investment. > Does anyone have a corrections file for the Eye One Display 2 and a > GB-LED backlight display? Or perhaps be thinking about either making > one, or including GB-LED support into argyllCMS/dispcalGUI as a new mode? The variability of the instrument is such that I'd be a bit suspicious of a correction matrix made for a different instance of the i1d2. > If not, any ideas on how to make or fake one at home? The best way of course is to use a spectrometer (ie. i1pro or ColorMunki spectro.) as a reference on your display against your i1d2. > One idea.The monitor claims to come factory calibrated within 3 delta > E (fingers crossed.) Is there at least a way to make a correction file > that uses the factory calibration as a trusted baseline so I can > always get back to that even if the colors drift over time (or if I > want to customize the calibration)? OK, here's an outline of how you might go about this. I'm leaving out some details, and I haven't actually tried it, so you may well need to troubleshoot the procedure: Create a reference test set of (say) a 3^3 or 4^3 cube set using targen, ie. something like: targen -v -d3 -e0 -B0 -m3 -f0 test Copy this to a reference set: copy test.ti1 ref.ti1 Set your new display to (say) sRGB mode, and measure the test set with your instrument. dispread -v -yl test Create a reference set using the sRGB.icm file, that we assume the new display is calibrated to: fakeread -v sRGB.icm ref A problem with this is that the real readings will be returned to absolute values (cd/m^2), whereas the fakeread values are normalised to 100, so we will have to make sure that the fakeread values get scaled the same way. Open the test.ti3 file in a text editor and copy the LUMINANCE_XYZ_CDM2 line, ie. for the sake of an example: LUMINANCE_XYZ_CDM2 "46.509281 49.445099 45.615122" into the ref.ti3 file in a similar position. This should cause the values to be scaled to match the instrument values. Create a ccmx correction matrix from the ref and test results: ccxxmake -v -f ref.ti3,test.ti3 correction.ccmx You can then use the correction matrix with your instrument on that display, ie. dispread -yl -X correction.ccmx etc. Graeme Gill.