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The joys of the emerging range of wide gamut monitors.
On Tue, 13 Jun 2017 20:52:36 +1200, Eric Stevens wrote:
I've now got it sorted and both monitors look the same. More to follow tomorrow - a valuable lesson for all and sundry. Well sundry anyway. Well? ;-) -- croy |
#12
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The joys of the emerging range of wide gamut monitors.
On Fri, 16 Jun 2017 18:38:57 -0700, croy
wrote: On Tue, 13 Jun 2017 20:52:36 +1200, Eric Stevens wrote: I've now got it sorted and both monitors look the same. More to follow tomorrow - a valuable lesson for all and sundry. Well sundry anyway. Well? ;-) Well it sometimes seems as though tomorrow never comes. It finally did a few hours ago. I have written further down what I responded to Dell. By way of explanation, the Dell monitor concerned employs an internal Look Up Table (LUT) for color calibration rather than relying on an ICM file in Windows to profile the monitor. In fact the monitor comes with preset calibrations for: AdobeRGB sRGB Rec709 DCI-P3 Cal1 Cal2 Cal1 and Cal2 are free to be calibrated to whatever color space the user wants. Dell supplies color profiling software 'Dell UltraSharp Color Calibration System' (DUCCS) which is intended to work with an X-Rite I1 Display Pro sensor. The DUCCS software is written by Dell and appears to be a plug-in or similar to X-Rite software. I have purchased an I1 Display Pro and have run it both with the X-Rite software (which only produces an ICM file in Windows) and DUCCS. I was having an enormous amount of trouble with DUCCS which is how I became involved with the second tier of Dell technical support. Here beginneth what I wrote to DEll: ======================================== I have successfully calibrated both monitors and I thought I would write you a short report about what I have done. I now have everything going. Cal-1 is Native on both screens and Cal-2 is AdobeRGB. I have used Windows Photo Viewer to simultaneously put up the same raw image side by side on both screens and compared them. I cannot see any differences. Cal-1 (native) is a slightly wider gamut than Cal-2 (Adobe RGB). I was interested to notice that the colors of Cal-2 were not quite the same as the screens' AdobeRGB setting. However when I used the I1 Profiler software (not DUCCS) to establish an AdobeRGB profile for the AdobeRGB setting there was only one color patch on one screen for which the calibrated version visibly differed (and then only slightly) from that of the AdobeRGB setting in the screen. I attribute my initial problems to three major factors: 1. I did not fully understand what DUCCS was doing. In particular I did not at first understand why a screen calibrated by an internal Look Up Table (LUT) should also require an external ICM color profile. This may have led me to do inappropriate things with the settings in Windows Color Management. I hope I have corrected this and I will discuss it further below. 2. As you suggested, I may have had problems in Windows. It was only after I ran ‘sfc /scannow' (as an administrator) and found several errors that I was able to consistently calibrate both screens. 3. DUCCS has problems which don't help the novice user (and it has several other problems as well). I will discuss these below. My Understanding of what DUCCS is doing. ----------------------------------------------------- Even if the UP2516D has its own color management under the control of its LUT it is not possible to leave all color management entirely to this. First, in the absence of a monitor color space the computer's color management is liable to output an image anywhere from sRGB to ProPhoto and the monitor will have no particular idea of what to do with it. Second, even if it is possible to calibrate Cal1 and Cal2 to correctly display a particular color output from the computer the preset AdobeRGB, sRGB etc will not be able to cope with a color space other than that for which they were calibrated. For this reason it is necessary to assign an all-purpose color space to the UP2516D so as to give a uniform input with which the various preset settings can work properly. This is the UP2516D.ICM to be found under ‘profiles' in Windows color management. No doubt you will tell me if I am wrong in my understanding. I did not initially understand any of this and every time I calibrated (say) Cal2 on screen 1 I would save a file DELL1Cal2.ICM. Certainly I was confused and probably so was Windows. I now have only the one UP2516D.ICM. I cannot emphasize too much my belief that I would have been considerably helped by a simple explanation of how the color calibration worked. This should also make clear that the factory presets cannot be recalibrated (if that is indeed the case). Problems of DUCCS ------------------------- I still have no understanding of what it is that generates the notice "Could not set the display default luminance. Error communicating with display. Please verify USB connection" However, I did notice that when the color patches first appeared, after clicking the right arrow to go to ‘next' (measure), when the button under the color patches appeared it would take a short time to react and then say something about being ‘unable to detect the screen'. After a more noticeable time delay it would then announce ‘Measure'. I learned to ignore the initial warning and wait for the final ‘Measure'. Some of my problems may have been caused by me reacting to the ‘unable to detect screen' message without realising that I should wait a few more seconds. There is a problem with what may be a section of the software written by X-Rite. When one opens DUCCs in advanced mode and clicks on ‘Profile' the screen changes to display a color diagram with triangle marking out the gamut of the color space. This can display colors and the color space in x,y coordinates or u',v' coordinates. The color space triangle changes according to the selection within the ‘RGB Primaries' tab alongside. There is something very wrong with the software governing this diagram. The gamut of ‘native' is shown as the same as that of ‘sRGB'. This is definitely wrong. The gamut of ‘AdobeRGB' is shown as greater than ‘DCI-P3' and I think this may be wrong also. One can get all kinds of strange results by switching up and down through the selections and at the same time switching back and forward between x,y and u',v'. Someone should have a good look at this. ============================================ I am using both screens with their native color space and the view is magnificent :-). Even AdobeRGB looks slightly dull in comparison and as for sRGB ... . I now wonder how we put up with sRGB. As I recently didn't quite write in another article 'The future is coming and it is wider gamut color spaces'. I'm sure some of you already know that. Reviews of the Dell and other screens using similar high-gamut technology are hihly critical of quality including uneven colour distributions and uneven backlighting. I only started to encounter these afte I had bought the first UP2516D and I was very glad that I had seen no evidence of this kind of thing in the first one that I bought. It was with trepidation that I bought the second screen but it too seems to be qually problem free. Maybe Dell (or LG in fact) have sorted out their problems. Anyway I am now a happy user and I can't speak too highly of the help I got from Dell. I'm not so happy with the DUCCS software but I have learned to navigate a safe path through its peculiarities. At one stage I wrote to Dell: "I notice the screen firmware uses C++ which has been described as 'Write once, read never' language. There are obviously errors somewhere in the software and I pity the person who has to find them." But it all works. -- Regards, Eric Stevens |
#13
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The joys of the emerging range of wide gamut monitors.
In article , Eric Stevens
wrote: I am using both screens with their native color space and the view is magnificent :-). Even AdobeRGB looks slightly dull in comparison and as for sRGB ... . I now wonder how we put up with sRGB. try dci-p3 and you'll wonder how we put up with adobe rgb. and then there's rec. 2020... |
#14
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The joys of the emerging range of wide gamut monitors.
On Sat, 17 Jun 2017 02:16:48 -0400, nospam
wrote: In article , Eric Stevens wrote: I am using both screens with their native color space and the view is magnificent :-). Even AdobeRGB looks slightly dull in comparison and as for sRGB ... . I now wonder how we put up with sRGB. try dci-p3 and you'll wonder how we put up with adobe rgb. Right now I'm doing the best that the monitors can do, such as it may be. and then there's rec. 2020... -- Regards, Eric Stevens |
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