• If you’ve messed around with the gains/levels in the TV color controls, undo those changes.

    DisplayCal is a program where until you learn and realize why you want to change a setting, you go with the defaults. Powerful controls mean getting things wrong if you don’t know what they do.

    While DCal presents you with options for calibration such as…[Read more]

  • I must apologize Vincent, I’m stretching the limits of the forum.

    That post to Greame I included was not mine! It is a random coincidence that I  copied/pasted because it has a specific, though oblique bearing on the topic… I thought I was being clear but the discussion area, but obviously I’m not. So let me  try to regroup and follow up with a…[Read more]

  • Matrix vs XYZLUT is macOS limitation, not a limitation of ICC based systems. Same for some apps.

    My comment was made in full awareness of this.  XYZ LUTs help when the device has considerable non-linearity or cross-overs, e.g., printing inks and papers. But good displays don’t have this behavior, making the computational cost of a LUT profile…[Read more]

  • The documentation for DisplayCal is very clear in making a distinction between Calibration, bringing a display into conformance with a performance standard, and Characterization, an ICC profile which accurately describes the display’s behavior.

    What are the limits of an ICC profile overcoming some aspects of display non-compliance?

    FIrst let’s…[Read more]

  • Your Macbook is very well aligned from factory for your purposes. The screen should look great out of box and be colorimetrically decent.

    If it looks bad, check Displays  > Color pref to ensure the built-in display profile is selected, it’s named something like “Macbook LCD” or some such. If it gets deleted it will automatically be r…[Read more]

  • Both profiles were made as single+matrix

    But it’s possible one was made “Gamma 2.2: Gamma 2.2” and the other “Custom: Gamma 2.2. I overwrote the storage before I really though about that plot distinction, so I can’t be sure.

    Is there a way to set the TRC to one curve and get the calibration to follow a different curve?

  • When doing a verify for a G2.2 calibration, sometimes the measurement report references an ideal flat-line gamma, and sometimes it references the cal-time measured (real) gamma.

    See attached two screenshots and corresponding reports.

    I can’t figure out the preconditions for this variance.

    Per previous dialog on nature and value of this graph, I…[Read more]

  • Under Calibration: Tone Curve there is a “Gamma 2.2” with options 1.8, 2.0, 2.2, 2.4

    There is also a “Custom” selection with the same options.

    How do these differ?

  • Ah, of

    To be clear, I just mentioned DUCCS so readers would understand context of comment. I had no way of determining what’s limiting this function.

    It’s an unwanted behavior but both displays work the same way., so not fair to call it malfunctional in sense of a blown-gasket 🙂

    My thought was they are being slavish to accuracy by not letting…[Read more]

  • UP2516D in Cal1/2 mode locks out Bright/Contrast on front-panel. DDC/CI also locked out.

    DUCCS UI gives no indication of how to avoid this. I tried “Native” in the luminance selector, but that sets to max and still locked.

    Firmware is up to date as of Jan.

    If there’s a way to prevent this it would be nice to know.


  • Been using Dell DUCCS (Dell’s co-branded i1 Profiler) to write cal into display LUTs and the cal looks and works great with good options for alignment, except for one detail:  brightness is locked at whatever setting chosen during calibration with no option to adjust on fly. For me it’s a deal-breaker on using internal LUTs  ’cause I can’t c…[Read more]

  • Wire replied to the topic HDR Caibration in the forum Help and Support 6 months ago


    To be clear, when you say factory mode, per Florian “native”, Dell’s most native mode is Custom Color with default subsettings. Precal white by backing Gains off from 100 as minimally as possible.

    Standard mode is most Native with Dell’s idea of D65. But you can do significantly better by playing with Custom Color to pre cal…[Read more]

  • Re concept of surround, been reading the sRGB whitepaper (linked) in the help and considering in context of history of TV and Poynton’s open letter to industry which resulted in the creation of bt1886:

    Does the idea of “daylight” surround occur in some spec? sRGB doc only mentions “dim” and “dark” surround which it took me a double take to…[Read more]

  • Hey Florian, thanks as always for your kind reply.

    So the “bug” in my post title is maybe too-strong or a totally appropriate term…

    I experimented some more and find that my trouble is in strictist sense an operator error, but one which maybe can be prevented.

    The problem appears precisely when profiles are placed in both /Library/Colorsync…[Read more]

  • During previous comments on forum I’ve mention how I’ve had ongoing trouble with profile verification. This appears to be a glitch in how DCal interacts with MacOS over profile locations.

    When a verification pass is run, there is an implicit question as to where the display profile used for the verification should be loaded from.  From a…[Read more]

  • Can you guys help me with understand the intent of the measurement report Gamma tracking graph? I can’t figure out how to contextualize what that graph says. (Attached)

    Just in case I’m missing something obvious, here’s how I am taking it:

    I see the X axis is luminance as a percent, and the Y axis is the a pure power law response that…[Read more]

  • Here are quick verifies for UP2516D DUCCS sRGB loaded into Cal2 against sRGB IEC61966 2.1

    1. GB-r / RG family ccss
    2. PFS WLED family ccss
    3. DELL UP2516D i1 Pro 2 ccss

    Happily, things are coming together

  • UP2516D DUCCS reports “Selected calibration matrix: GB-LED”

  • I would add… it’s not even close to a GB-LED like U2413 although if an i1d3 is a good match to CIE 1931 2 degree in those long wavelengths it may not matter at all (nothiong to correct on those wavelegths).

    This is a: U2413, like the one in “cleaned” CCSS from DisplayCAL:
    Orange (1nm resolution)
    User data 3nm from an UP2516D … or a UP2716D,…

    [Read more]

  • I suggested that you may try to use the ones available to DUCCS. These are 2 and are bundled with DisplayCAL: RGPhosphor (U2413+others packed together), WLED PFS P3 95% Panasonic etc that was added in DUCCS 1.6. I did not suggest to try that alone but both.

    Got it…

    Also if yu want to use DUCCS and validate its results with the same set of rules…

    [Read more]

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