What correction is the correct one?

[Anonymous]

Hi,
I’m running DisplayCal on my MacBook Pro 15″ 2018.
When I’m calibrating the MacBook Pro display it’s fine with Auto (none) correction and it looks good, but I also have a Philips 328B6Q (2k display) connected to it and when I calibrate that display the gray get greenish.
I’m wondering if I need some correction on it or similar? I have adjusted the display settings manually first so it looks good according to the measurements and then I’m running the profiling.

I have a i1display Pro rev. b when I’m profiling the displays.

Calibrite Display Pro HL on Amazon  
Disclosure: As an Amazon Associate I earn from qualifying purchases.

[Vincent]

If you do not find an specific correction for those displays in displaycal’s colorimeter correction database, then as a general rule:

-sRGB displays: WLED correction bundled with DisplayCAL

-P3 displays like newer imacs or newer macbooks with P3 screen: Panasonic VX… (its a WLED PFS phosphor backlight)

If after calibrating yo fins slight tints in one screen , use visual point editor to match, it should be explained in documentation or some FAQ here.

[Anonymous]

If you do not find an specific correction for those displays in displaycal’s colorimeter correction database, then as a general rule:

-sRGB displays: WLED correction bundled with DisplayCAL

-P3 displays like newer imacs or newer macbooks with P3 screen: Panasonic VX… (its a WLED PFS phosphor backlight)

If after calibrating yo fins slight tints in one screen , use visual point editor to match, it should be explained in documentation or some FAQ here.

I can’t find the P3 setting or is I missing something, here is a screenshot over my options.
I guess that I should use the P3 option as I have a MacBook Pro 15″ 2018

[Vincent]

P3 is not a “setting”, P3 coverage % value is an attibute of a display.

If you own a sRGB LED display (usual monitors), choose “Whit LED IPS…”

If you own a P3 macbook/imac and you did not find a suitable correction in Displaycal colorimeter correction database , then use “Panasonic VVX17P….”.
A fast measurement of RGB primaries should point to which macbook do you own, or find it in vendor specifications.
Also a non color managed P3 display has a distinct oversaturated red, but since you have macOS it is more difficult to spot visually.
Newer macbooks are likely to be P3, but measure it and you’ll know it for sure.

[Anonymous]

Ok I see but how do I measure so I know if I should use the p3 or not?

i guess that I should do it as I have the latest MacBook Pro 15” but I still want to know how to measure so I know for sure?

[Vincent]

I think that “uncalibrated screen report” in “tools” menu without spectral correction is the fastest way (user friendly) to measure native 255 red.

[Anonymous]

I think that “uncalibrated screen report” in “tools” menu without spectral correction is the fastest way (user friendly) to measure native 255 red.

Thanks, I’m at work now but I’ll try this when I get home.

[Anonymous]

I think that “uncalibrated screen report” in “tools” menu without spectral correction is the fastest way (user friendly) to measure native 255 red.

Hi again, I have done that now but I can’t see what I’m looking for, here is my results.

19:48:38,799 ————————————————————————————————————————

19:48:38,799 Report on uncalibrated display device

19:48:38,810 ————————————————————————————————————————

19:48:38,811 Command line:

19:48:38,811   /Users/rstolpe/Argyll_V2.0.1/bin/dispcal

19:48:38,812     -v2

19:48:38,812     -d1

19:48:38,812     -c1

19:48:38,812     -yr

19:48:38,812     -P0.500745897563,0.501683501684,1.5

19:48:38,813     -R

19:48:38,813

19:48:38,836 DisplayCAL: Starting interaction with subprocess

19:48:39,812 Setting up the instrument

19:48:40,849 Product Name:      i1Display3

19:48:40,849 Serial Number:     I1-16.B-02.249122.06

19:48:40,849 Firmware Version:  v2.28

19:48:40,849 Firmware Date:     29Jan14

19:48:41,218 Place instrument on test window.

19:48:41,219 DisplayCAL: Waiting for send buffer

19:48:42,720 DisplayCAL: Skipping place instrument on screen message…

19:48:42,731 DisplayCAL: Sending buffer: ‘ ‘

19:48:42,785 Hit Esc or Q to give up, any other key to continue:

19:48:45,393 Measured display update delay of 44 msec, using delay of 158 msec & 0 msec     ↲

↳ inst reaction

19:48:49,828 No distict refresh period

19:48:56,996 Patch 3 of 3

19:49:07,132 Patch 17 of 17

19:49:16,945 Patch 17 of 17

19:49:16,946 Uncalibrated response:

19:49:16,946 Black level = 0.1082 cd/m^2

19:49:16,946 50%   level = 20.42 cd/m^2

19:49:16,946 White level = 120.53 cd/m^2

19:49:16,947 Aprox. gamma = 2.56

19:49:16,947 Contrast ratio = 1114:1

19:49:16,947 White chromaticity coordinates 0.3108, 0.3335

19:49:16,947 White    Correlated Color Temperature = 6574K, DE 2K to locus =  8.4

19:49:16,947 White Correlated Daylight Temperature = 6573K, DE 2K to locus =  4.6

19:49:16,948 White        Visual Color Temperature = 6258K, DE 2K to locus =  8.1

19:49:16,948 White     Visual Daylight Temperature = 6411K, DE 2K to locus =  4.4

19:49:16,948 dispcal: Warning – Unable to determine effective Video LUT entry bit depth

19:49:16,948 The instrument can be removed from the screen.

19:49:17,006 DisplayCAL: Reached EOF (OK)

[Vincent]

Sorry, my fault. It is not “uncalibrated display report” (argyllCMS: dispcal.exe -v -R ) but “Verify calibration” in the same menu (ArgyllCMS: dispcal.exe -v- z).

Log should show something like:

Switching back to calibration being verified
Black = XYZ 0.1320 0.1437 0.2492
Red = XYZ 66.900 30.237 1.025
Green = XYZ 26.677 83.870 9.008
Blue = XYZ 22.925 7.044 123.075

Then cancel the task, since you just want to get these numbers. Now get xyY for native green and red and check if it is P3 or sRGB or whatever it is.

[Vincent]

Or use Microsoft Paint to get a huge patch with 255 green or red and then use ArgyllCMS “spotread.exe” over them.

Choose the one that looks more easy to you.

[Anonymous]

Sorry, my fault. It is not “uncalibrated display report” (argyllCMS: dispcal.exe -v -R ) but “Verify calibration” in the same menu (ArgyllCMS: dispcal.exe -v- z).

Log should show something like:

Switching back to calibration being verified
Black = XYZ 0.1320 0.1437 0.2492
Red = XYZ 66.900 30.237 1.025
Green = XYZ 26.677 83.870 9.008
Blue = XYZ 22.925 7.044 123.075

Then cancel the task, since you just want to get these numbers. Now get xyY for native green and red and check if it is P3 or sRGB or whatever it is.

Here is my results for the Philips screen:

21:32:09,296 Switching back to calibration being verified

21:32:09,298 Black = XYZ 0.1073 0.1048 0.2181

21:32:09,299 Red   = XYZ 58.057 28.040  1.163

21:32:09,299 Green = XYZ 21.540 55.823  7.464

21:32:09,299 Blue  = XYZ 22.696  8.463 119.084

21:32:09,300 White = XYZ 110.431 119.115 126.788

And here is the results for my MacBook Pro 15″ 2018

21:35:09,481 Switching back to calibration being verified

21:35:09,483 Black = XYZ 0.0570 0.0622 0.1015

21:35:09,483 Red   = XYZ 40.393 19.607  0.000

21:35:09,484 Green = XYZ 24.382 63.522  4.128

21:35:09,484 Blue  = XYZ 18.378  6.388 97.648

21:35:09,485 White = XYZ 83.323 89.702 101.510

So, is both P3 displays?

[Vincent]

http://www.brucelindbloom.com/index.html?ColorCalculator.html
Then press XYZ button and read xyY row

For comparison:
https://en.wikipedia.org/wiki/DCI-P3
https://en.wikipedia.org/wiki/SRGB

or just open “DisplayCAL-profile-info.exe” and in xy 2D plot look were these coordinates fall.

[Anonymous]

I’m really confused can you help me to see if I have P3 displays?
And if I don’t have P3 displays what correction should I use?

[Vincent]

Macbook: YES

Philips is more saturated than sRGB but not as much as a P3 display, difficult to know a suitable spectral sample. Try WLED, or a P3 correction like macbook… or none. Check which white looks visually better.

[Anonymous]

I guess that I need to choose the MacBook Pro Retina 2016 for my 2018?
I did update and I did found this new correction.

(See screenshot)

[Author]

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