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  • #35607

    Papayaman
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    Hi. I am new to calibrating but think I atleast got the basics.
    For a Dell U2520D should I use the “LCD White LED family” or “LCD PFS Phosphor WLED Family” correction?
    Using a Calibrite Colorchecker Display for now but will get the Colorchecker Display Pro next week.

    Dell specs say W-LED but afaik this is a wide gamut monitor so I’m unsure about this one.

    Best regards.

    #35609

    Vincent
    Participant
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    Take a look at (ArgyllCMS command line “specplot myfilename.ccss”)
    https://colorimetercorrections.displaycal.net/hash/5db7b27d7f9b4bdbb99fd78adaf8c1be/Dell%2C%20DELL%20U2520D%20by%204KM%20%28i1%20Pro%202%29.ccss

    Looks like a 95% P3 WLED PFS phosphor => bundled “Panasonic VVX17P051J00.ccss” in DisplayCAL, “Panasonic VVX17P051J00.edr” (PFS phosphor) in Xrite software.
    You can use this user made CCSS too.

    Dell specs say W-LED but afaik this is a wide gamut monitor so I’m unsure about this one.

    Unfortunately lots of vendors and webs label “W-LED” to a whole set of sets of displays with very different backlights. It’s like “mammal”, a mouse is a mammal but a whale is a mammal too.
    W-LED is just a name, a very generic & ambiguous one.

    To avoid such misleading names here, in this forum, it’s common that users add surnames to that name so it is no longer ambiguous, for example:
    95% P3 WLED PFS => yours, “Panasonic VVX17P051J00” (green main wavelength is longer)
    P3 WLED PFS , Apple WLED PFS  => same tech as above but green main wavelength is a little shorter that above to give P3 green. CCSS is bundled in displaycal, no equivalent EDR in Xrite
    AdobeRGB WLED PFS => Same as first one, but green main wavelength is the shortest of this family, to give AdobeRGB green
    White LED/WLED => Common LED monitors with sRGB colospace, backlight is a blue led + yellow phosphor which give such limited green & red primaries.

    Some respected webs even label those one with more ambiguous & misleading names like “wide gamut blue led-RG phosphor LED” for AdobeRGB flavor of WLED PFS models like Eizo CG319X.
    “Just names”, what trully characteize a display is its spectral power distribution, the data inside a CCSS/EDR (or a 2D plot of such data). It’s like a fingerprint of the LED & phosphors and that is what software needs needs to correct your colorimeter raw measurements

    • This reply was modified 2 weeks, 1 day ago by Vincent.
    #35620

    Papayaman
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    Thanks alot for the reply!
    I’ll try it out once I get the Pro version.

    I’m sorry for not understanding all of this yet and being a complete noob but how do I know what uploaded user correction to use? As I look at the different ones some of them seem to have used PFS, some standard WLED, some Auto(Nothing).

    #35621

    Vincent
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    Thanks alot for the reply!
    I’ll try it out once I get the Pro version.

    Why? same HW, you can test right now.

    I’m sorry for not understanding all of this yet and being a complete noob but how do I know what uploaded user correction to use? As I look at the different ones some of them seem to have used PFS, some standard WLED, some Auto(Nothing).

    ArgyllCMS command line “specplot myfilename.ccss” or DisplayCAL CCSS info buton

    • This reply was modified 1 week, 6 days ago by Vincent.
    #35644

    Papayaman
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    Hi again Vincent. Using the user made CCSS you suggested I can only use Mode:Refresh(Generic). If I set it to LCD it changes correction to None..  Should I use it anyway with Refresh or is that correction wrong?

    #35650

    Vincent
    Participant
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    It is because Argyll code wrote refresh “YES” by default to CCSS when making the correction. Change text to “NO” in CCSS file (edit it) or leave it as is and choose refresh.
    Little to no change will be applied to measurements because refresh, maybe in very low light readings but i don’t remember.

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