On samedi 01 décembre 2007, Graeme Gill wrote: > Which version of Argyll are you using ? 0.70 (BETA6) > The profile white point certainly look strange. > I suspect that iccexamin isn't computing the white point > temperature the same way as Argyll though, or the extreme white point > is showing up the difference between Visual Daylight Temperature > (which is where Argyll uses a modern measure of closest to > the daylight locus - CIEDE2000), vs. the traditional CIE 1960 UCS > space color difference formula used for Correlated Daylight Temperature, > or Correlated Color Temperature (black body locus). Ok. Note that both iccexamin and lprof show the same value. > > Second, it seems that red color is over-saturated... > > Neither the calibration nor channel response curves look unusual. Could it be a problem with lcms-based apps? All of them show the images with the same red color saturation. Is there a tool in argyll suite to convert a picture in the monitor color space? Then, if I display it without any color engine, it should look the same. Am I wrong? > This is strange. You specified -m, yet dispcal hasn't skipped > the monitor adjustment step. I sould have made a mistake when I cut/paste the log... > > Adjust R,G & B gain to desired white point. Press space when done. > > Initial B 110.80, x 0.1985, y 0.3899, VDT 6762K DE 30.2 > > / Current B 110.72, x 0.1984, y 0.3907 VDT 6753K DE 30.2 R+ G-- B+ > > Note the white point is correlated to 6753K with a delta E of 30 ! This > means that the white point is far from actually being at 6753K, merely > that 6753K is the closest daylight temperature to the actual white > point. > > If you want to actually have a white point lying on the daylight > temperature locus, you need to adjust the RGB gain controls so as to > reduce the delta E to near zero. Notice that the interface is suggesting > you reduce green to move the white point in the right direction, or > possibly increase Red and Blue. Ok, I understand. > > Initial native brightness target = 80.845374 cd/m^2 > > Had to scale brightness from 80.845374 to 80.818901 to fit within > > gamut Target white value is XYZ 40.724326 80.818901 84.670188 > > Notice the strange X value - this is because you've let dispcal > calibrate to the native white point, and you've set your native white > point to be extremely green. This is true that I really see a green color cast on my monitor. But as soon as I load the LUT, with dispwin, then, no more green! And even if there is a red saturation, grey remains grey. I'll make more tests. -- Frédéric http://www.gbiloba.org