Thank you. I am sorry about this long post, but I tend to think clearer when I have to formulate my misconceptions :-) Colorimeters are simulating the spectral response of a standardized human viewer "long", "medium" and "short" sensory elements, right? While spectrophotometers are sampling the spectrum at higher resolution then combining the response into something similar. After som googling, I have the impression that the Spyder 3 line share the same basic sensor and that it does fairly well for wide-gamut displays? How much of this is software? I.e., if I had access to 3 or 4 different calibration softwares, using my Spyder 3 express, would they give very different results? I assume that any application with correction matrixes for my sensor (possibly in combination with WGC displays, or even my model display) will have an upper hand, but other than that, the profiling is more mathematics and sensible regularization than magic? My display came with a color calibration factory report, stating that Average Delta E was "<5.0" for both sRGB and aRGB profiles (plots suggest maximum "DeltaE*CIE94" of less than 3, average of 1 or so) using a Minolta Color Analyzer CA210. It also shows gray-scale tracking and gamma curves, but I find them hard to make something out of. Evidently, color temperature is a constant 6500K for grey levels >25, but strays off into cooler values for grey levels <25. When my display offers a simulated "sRGB" mode (that from tests is judged as fairly good), am I right that it is the only way for me to get sRGB appearance from non-color-managed applications/OS-es? Since ArgyllCMS make nice profiles that will not be used in that case, and the display calibration only touches white-point and brightness (no front-panel 3x3 matrix input)? Further, as the display is native 8+2 bits, 12 bits processing, while DVI is practically limited to 8 bits (displayport does 10 bits, possibly also with this screen but is not recommended by Dell due to wake up from suspend quirks, http://en.community.dell.com/support-forums/peripherals/f/3529/t/19339056.aspx), this might avoid banding issues. How does ArgyllCMS relate to Madshis MadVR and "3DLUT"? I take it that its massive 96MB LUT does an exhaustive lookup of every possible "rgb" input to its corresponding "rgb" output, meaning that no parametric simplifications have to be made (of course, regularization may come in handy anyways). But is that approach more suited for movies and other material that adhere to some agreed-upon standard, while editing photos in Lightroom/Photoshop is more suited for the real-time color management inside those applications? What does Wide Gamut really, physically mean? Does it mean that the spectra of the nominally "red", "green", "blue" primaries are sharper/narrower, giving less overlap and thereby allowing more saturated colors? When this is accomplished by swapping back-lighting, does it mean that the backlighting consists of 3 narrow peaks (meaning that there is little excitation in the regions where the panel "valves" might overlap)? Below I have updated the table of measured values with the tftcentral test. Sadly, both review sites use the Blue Eye pro. Comparing tendencies between them and me, I find that : 1. They measure my display to be too warm (5700K), while I measure it to be too cold (6900K) 2. They measure a lower black level than I do, leading to higher contrast and perhaps gamma issues (?). http://www.flatpanelshd.com/review.php?subaction=showfull&id=1265617565 http://www.tftcentral.co.uk/reviews/content/dell_u2711.htm#calibration out-of-the-box measurements: flatpanelshd TFT Central My calibration Instrument Blue Eye Pro Blue Eye Pro Spyder 3 express Black level = 0.23 0.25 0.38 [cd/m^2] White level = 225 208 242.78 [cd/m^2] Aprox. gamma = 2.1 1.9 1.80 Contrast ratio = 978:1 832:1 642:1 White chromaticity coordinates ###### ###### 0.2815 ###### ###### 0.3378 White Correlated Color Temperature (DE 2K to locus) 8186K (20.2) White Correlated Daylight Temperature (DE 2K to locus) 8157K (18.9) White Visual Color Temperature (DE 2K to locus) 6787K (19.8) White Visual Daylight Temperature (DE 2K to locus) 6904K (18.4) Color temperature 5867 5504 Display calibration: Brightness: 22 30 22 Contrast: 50 50 50 RGB: Manually • R: 88 83 100 • G: 84 94 81 • B: 89 87 83 Calibrated/profiled results: Black level = 0.12 0.18 0.25 [cd/m^2] White level = 106 121 116.59 [cd/m^2] Aprox. gamma = 2.2 (?) 2.2 2.18 Contrast ratio = 883:1 672:1 472:1 White chromaticity coordinates ###### ###### 0.3123 ###### ###### 0.3290 White Correlated Color Temperature (DE 2K to locus) 6524K (4.9) White Correlated Daylight Temperature (DE 2K to locus) 6524K (0.3) White Visual Color Temperature (DE 2K to locus) 6348K (4.7) White Visual Daylight Temperature (DE 2K to locus) 6513K (0.3) Color temperature 6520 6485 -k On Wed, Dec 8, 2010 at 12:06 AM, Pictus <pictus171@xxxxxxxxx> wrote: > Hello Knut, > > Also check the TFT Central resutls > http://www.tftcentral.co.uk/reviews/content/dell_u2711.htm#calibration > > The Spyder 3 may have problems with Wide Gamut LCD... > One time I calibrate(Spyder3) a DELL 2709W with ColorEyes Display Pro(they > have a 10 days trial) > and the results were good, sadly at that time I did not know > Argyll/DispCalGui. > > Also Quato iColor Display 3 have the correction matrices for wide gamut > LCD, but I do not know the details... > > > -- > Best regards, > Pictus mailto:pictus171@xxxxxxxxx > > >