The really frustrating part of making a calibration file is that there are so many parameters to experiment with, and every time you want to try a different parameter value, a new calibration file is required.ĭoes anyone know what part of the calibrating process makes it so slow? It doesn’t seem to be affected by the amount of RAM or the speed of the processor. On my reasonably fast computer a low quality calibration takes a couple of hours, and a high quality calibration+profiling is best left to run over night. Regarding the slowness of monitor profiling, it’s the calibration file that takes such a long time to create.
I’m still experimenting, and might also end up using a calibration file loaded into the video card LUTs. I changed the colprof parameters from “-as” to “-aS”, which eliminates abrupt hue changes in the deep shadows of what are supposed to be neutral gray gradients. I used the monitor RGB Temperature controls to set a custom white point, setting R=255, G=238, B=250, using Displa圜al to guide changes to the monitor RGB values. So for my latest monitor calibrating/profiling I’ve resorted to two changes in how I calibrate and profile my monitor: I’m guessing the reason the Color Temperature for my monitor is steadily falling and the DE rising might be because the CCFL backlight is getting dimmer over time.Īnyway, I suspect my monitor might be on the downward slope of useability - I’ve noticed that using my usual “no calibration file, use native white point and gamma” approach to profiling has resulted in neutral gray midtones looking a bit green. If anyone else has records of how your uncalibrated monitor display characteristics have changed over time, I’d be very interested. The measured “Color Temperature” started out around 5800K with a DE of around 5 or less, and over the years the temperature seems to be steadily trending downward and the DE drifting upward, currently measuring around 5200K, with a DE of around 10. The measured “Contrast ratio” has stayed fairly close to 256:1, with no obvious trend up or down.
#Nec adjust white point displaycal manual#
gamma” has stayed reasonably close to 2.2 - which is what the manual that came with the monitor says it’s supposed to be - with no obvious trend up or down. The measured “Black level” has stayed reasonably close to 0.24 cd/m^2, with no obvious trend up or down over the years. So for what it’s worth, over the last 9+ years, and always using the monitor’s native white point and gamma, and with the measured “White level” kept in the range 60-75 cd/m^2: Over the years I’ve kept more or less complete (though very disorganized) profiling notes, including information on the uncalibrated display characteristics (ArgyllCMS command “dispcal -R”). Regarding how slowly or quickly a monitor’s display characteristics might change over time, I’ve been using the same monitor - an NEC LCD2190UXI - since somewhere around 2008.
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