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I created a profile & installed it using DisplayCal, and it’s caused MacOS menus and other highlighted UI elements to discolor (they appear green instead of grey). Photos and other content appear undistorted. What could be causing this?
Screen shot: “calibrated” on the left, normal on the right.
It’s OSX fault. It seems that cannot deal with rounding errors caused by independent TRC per each channel (another drawback from “forced” color management in desktop).
Make a single curve + matrix profile (avoid using “curves + matrix” or “XYZLUT” profiles since they’ll have 3xTRC) and that issue should be gone.
That worked to resolve the UI problem, but now I’m getting strange color noise in the shadows in my images. Example:
Left: profile off right: profile on
That worked to resolve the UI problem, but now I’m getting strange color noise in the shadows in my images. Example:
Left: profile off right: profile on
They could be
-calibration errors caused by your graphics card LUT (should not happen with a display driven by a dedicated AMD card)
-inaccurate calibration, take a look on “calibration curves” with displayCAL profile info app
-rounding errors or non zero output for black in TRC, try to make a profile with black point compensation, but if you did a single curve+matrix I think that it is enabled by default so this should not be the cause.Take a look on “calibration curves” in the lower end (left & down), maybe a channel needed to be moved too off from “no calibration”.
Measurement device may be the culprit too because of poor accuracy in low light readings. You didn’t post info regarding measurement deviceThanks for the help. This is a Mac Pro w/D700 GPU, the display is an LG B6 OLED. I’m using a keep-awake movie that doesn’t affect ABL to keep it from going to sleep, and a small patch size to keep the ABL from interfering. Black point compensation was enabled. I’m using an Xrite i1 Display. I’ll grab a screen shot of the curves at the next opportunity.
There were several “i1Display”. I think that you mean the last one, “i1DisplayPro”. Older i1Displays won’t be able to measure an OLED.
Consumer W OLED have a not very stable response even at light levels that do no not kick in brightness limitation.
Matrix profiles aim to a somehow idealized display response so a consumer TV is a candidate for XYZLUT profiles with a huge number of patches. Even a XYZLUT profile verification made for an W OLED may not validate as good as it should for other monitors/TV.OSX color management limitations + consumer W OLED is a bad mix.
Try to run a profile verification of your matrix+single curve with huge number of patches and see how it performs in dark colors. Look for deviations in actual TV response against such idealized matrix + single curve profile. The issues you spot should be there.
A solution of compromise for your issues would be to overwrite TRC tags in a XYZLUT profile with a common averaged neutral TRC for each channel.
May be you want to suggest Florian Höch to put a “checkbox” for XYZLUT profiles in DisplayCAL in order to fake averaged neutral TRC response from actual 3 TRC curves based on measurements. Right now there is a “black point compensation” option for XYZLUT profiles in order to fake display response near black. An “averaged neutral TRC response” option would be similar to that, unchecked by default.Another option is to complain to Apple to solve their issues with rounding errors in their desktop color management engine when you use 3 TRC.
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