Dell SE2216H calibration help needed

[Zsolt]

Hi Everyone

I have 2 displays, both are VA panel technology. My main display is a Samsung CF791 Ultrawide with quantum dot technology, I was able to match the colors pretty closely with a calibrated Asus Vivobook Pro 16X OLED, which is the display I consider as the ground truth for my work.

However I have a secondary display (DELL SE2216H) which is also a VA panel, but as far as I know it’s not quantum dot. Could not find any more information about the panel inside, and I don’t own a spectrophotometer to measure the characteristics of it’s backlight…

So, my question is: what correction matrix is the best pick for it?

I initially tried WLED, and compared it to PFS. PFS seemed to have slightly more accurate gray ramp (less banding) but both produces slighly more greenish/yellowish whites than the OLED or QLED panels.

Also tried the visual white balance method, if I managed to match the white as closely as possible, the rest of the grayscale ramp came out significantly cooler, than my other two panels.

[Vincent]

SE2216H  seems like a common sRGB monitor => White LED (which is not WLED PFS). Read it with no correction, primaries should be close to sRGB, if they are => White LED.

[Zsolt]

Thank you, i’ll give it a try.

From the last run I see this in the ICC profile:

EDID_red_x 0.634765625
EDID_red_y 0.33984375
EDID_green_x 0.3154296875
EDID_green_y 0.634765625
EDID_blue_x 0.1552734375
EDID_blue_y 0.0498046875
EDID_white_x 0.3134765625
EDID_white_y 0.3291015625

Chromaticity (illuminant-relative)
Channel 1 (R) xy 0.6469 0.3360
Channel 2 (G) xy 0.3031 0.6149
Channel 3 (B) xy 0.1476 0.0611

Red matrix column
Illuminant-relative XYZ 42.00 21.80 1.09 (xy 0.6472 0.3360)
PCS-relative XYZ 44.41 22.80 0.76 (xy 0.6533 0.3354)
Green matrix column
Illuminant-relative XYZ 34.81 70.65 9.41 (xy 0.3030 0.6150)
PCS-relative XYZ 37.57 70.85 7.83 (xy 0.3232 0.6094)
Blue matrix column
Illuminant-relative XYZ 18.28 7.55 98.07 (xy 0.1476 0.0609)
PCS-relative XYZ 14.44 6.35 73.89 (xy 0.1525 0.0671)

Actually not sure which one of the non-EDID lines represent the actual chromaticity of the primaries that i should compare with sRGB standards – the illuminant relative or the PCS relative?

• This reply was modified 4 years, 2 months ago by Zsolt.

[Vincent]

sRGB LED => White LED.

PCS is illuminant relative coords translated to PCD (D50) with some chromatic adaptation. DisplayCAL HTML report shows patches by default on PCS (“Relative”)
So you should choose illuminant relative although it won’t matter for this task. It’s a common LED sRGB monitor.

[Zsolt]

Thank you. Using no corrections worked (sort of). I got nice smooth gradients and there’s barely any color casting across the grayscale. I still can’t match the white color visually between the qled and the generic VA panel. (QLED vs. OLED is fine). I’m guessing this is maybe because the spectral characteristics of the generic VA panel’s backlight had wider red and green?… Just trying to understand.  I’m using absolute colorimetric on the OLED and relative colorimetric on the VA panels (as i understand this mode accounts for non-perfect blacks).

[Vincent]

Thank you. Using no corrections worked (sort of).

Then whitepoint reading is worse than using WLED, 9x% confidence (depending on you and std observer difference)

I got nice smooth gradients and there’s barely any color casting across the grayscale.

This is not relateted to colorimeter correctioncorrection.

I still can’t match the white color visually between the qled and the generic VA panel. (QLED vs. OLED is fine). I’m guessing this is maybe because the spectral characteristics of the generic VA panel’s backlight had wider red and green?… Just trying to understand.

Visual whitepoint matching is up to user. App has little to no role at all here.

I’m using absolute colorimetric on the OLED and relative colorimetric on the VA panels (as i understand this mode accounts for non-perfect blacks).

No. Those intents are about white point in LUT3D. Keep current white= relative. Move to designated coords = abs
Maybe you are talking about relative or abs TRC which is a different subject.

• This reply was modified 4 years, 1 month ago by Vincent.

[Zsolt]

I’m selecting the rendering intent in Photoshop, not in DisplayCal. I’m only using the generated ICC profile to tell Photoshop how to correct the colors on my screens.

[Vincent]

I’m selecting the rendering intent in Photoshop, not in DisplayCal. I’m only using the generated ICC profile to tell Photoshop how to correct the colors on my screens.

It does not work that way and you should leave it unmodified in color settings (PS cannot make use of abs col on screens it is always WP relative).
Also for softproofing it applies to simulated device, not to your screen,

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