I guess it depends on how old the monitor is and how extensively it was used. Technically "white" LEDs are blue LEDs with a yellow coating, and if that coating would decay over time, the screen would get bluer as it ages, and the gamut would also suffer. When calibrating display with dispcalgui is there a reading or measurement that gives you feedback on your contrast adjustment for the monitor? I mean, you get white point readings and can dial in the monitor's RGB controls accordingly, and you get your luminance reading so you can adjust monitor's brightness, but what about contrast? How would one go about determining what value to set contrast adjustment to? I've tried going for D75 but the gamut still reduces quite considerably, to about 86% sRGB if I remember correctly.Ĭould it be that over the years the monitor has drifted so much to blue that it mishandles color if it's not close to it's native white point?Īlso, slightly unrelated question to you Florian: The native white point seem to be around 8000K-8500K. Try some other cooler daylight whites like D70, D75 I have tried different RGB value and contrast combinations (going higher for RGB values and lower for the brightness, setting contrast to 50, 70, 85, 100) and the result is the same.Īlso, are you using the spectral correction ("WLED AC LG Samsung")?
If this is a normal behaviour, then can I ask for some suggestions as to what to do in this situation? If I leave the whitepoint to native and keep the monitor's RGB to default 50-50-50, the coverage bumps up to 94% of sRGB, which is kinda close to what you would expect, right? Could deviating from the default RGB controls really reduce the color gamut by so much? Then after the profiling is done, the dispcalgui tells me that my monitor covers only 82% of sRGB, and this is where my confusion lies. In the calibration stage I dial in the monitor's RGB controls to hit the D65 - I have to go from the default RGB of 50-50-50 to 20-46-9 to do that. My goal is to get my display as close as possible to Rec709/sRGB, so I'm calibrating for the D65 white point and 120 cd/m white level, Rec 1886 2.2 relative gamma, using LUT + swapped matrix.
#DISPLAYCAL WHITE POINT MAC OSX#
I'm running Mac OSX 10.8 and i1 Display Pro. I have encountered what I think is a strange problem while trying to calibrate my old Samsung XL2370 LED display.
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