Re: Dell UP2516D
Re: Dell UP2516D
- Subject: Re: Dell UP2516D
- From: Wire ~ via colorsync-users <email@hidden>
- Date: Sun, 5 Jan 2020 11:26:59 -0800
I've added a DisplayCall measurement report for this displays sRGB preset
mode.
I was a little unsure about posting such reports earlier per my caveat
about this DTP94 colorimeter, but since I got the correction file I prev
mentioned, everything's adding up.
Switching between presets for 6500K and my measured native-mode custom
profile yield no visible difference in white point. I was seeing a
deviation before, and not knowing to what to attribute it.
Adobe RGB verification forthcoming.
On Sat, Jan 4, 2020 at 9:30 PM Wire ~ <email@hidden> wrote:
> Whoops, it's UP2516D, not 2916
>
> Yes max brightness is slightly reduced by using calibrated modes compared
> to native, as is max gamut. Slightly.
>
> The great guys at DisplayCal have included a DTP94+UP2516D colorimeter
> correction file referenced to i1pro. Working with this I'm finding a slight
> change in white point and good repeatability. This may let me punt on
> getting an i1 for now. Fantastic!!
>
> I turned off uniformity compensation, pre-cal'd white and dark grey using
> DCal's pre-measurement feature, then re-profiled. This produces a perfectly
> matched pair that look right in every way I know how to judge, plus per
> above full native mode opens up brightness and gamut a smidge as compared
> to using the display's 6500 preset. And uniformity looks very acceptable.
> dE Max is still hitting 2.x, dE RMS 1. I added another iphone screen grab
> which nicely shows off the matching. I'm super stoked.
>
> Re Dell SDK I saw that too and have the same questions as you. There's no
> software in the box, as you would expect in this mature age of the webz...
>
> Re built-in LUTs: Wasn't Graeme of ArgyllCMS posting here a week ago that
> video nerds take this feature for granted 'cause lots of their tools are
> not color managed—not the way DTP folks think about it. Like they will have
> a whole pipeline that assumes 709 or SLog or who-knows-what and give the
> display whatever personality needed via its LUT? Also there's the MadVR
> stuff that's a renderer for high-end home theater. I use Kodi media viewier
> (was Xbox Media Center back in day) and it has support for loading a 3D LUT
> profile. Again this is stuff that's been in video for a decade or more is
> now being commodified.
>
> I'll run a DisplayCal verification report on the built-in Adobe RGB mode.
> It will look at more color and we'll see...
>
> On Sat, Jan 4, 2020 at 16:40 Roger Breton via colorsync-users <
> email@hidden> wrote:
>
>> In fairness, I had to change the title of the thread...
>>
>> The numbers in the report are good, Wire, and thank you for posting. I've
>> plough through the User Manual on Dell's web site but could not find any
>> references to the existence of "hardware LUTs"? I was looking for this
>> feature in view of the excellent Gray-Scale Tracking behavior. As for the
>> 'Gamut' tests, sRGB/AdobeRGB support, I don't think anyone could dispute
>> the < 2 Avg dE value presented in the calibration report. But I'd like to
>> see a comparison on more than a handful of color values? Perhaps DispCal
>> can crank out a more "extensive" report than Dell but it's worth nothing
>> the manufacturer's claim is based on a set 32 color samples (8 GS values +
>> 4 Red + 4 Green + 4 Blue + 4 Y + 4 C + 4 M), according to my reading of the
>> report. I'll bet the results based on a broader sample set will still be
>> very acceptable, Wire? (Didn't you already tested this with DispCal?) The
>> gray levels graph suggest that the unit is plenty gamma-corrected, out of
>> the box. The Brightness Uniformity figures are hard to resist / beat,
>> though? Same as the Color Uniformity figures? I mean, those kinds of
>> differences are minuscule to me -- almost too good to be true, but that's
>> probably the state of good, quality displays these days 😊
>>
>> Have you found that, when using one of the Presets (sRGB/AdobeRGB,
>> whatever), that the display Luminance changes accordingly? I read something
>> to that effect ....
>>
>> Last but not least, this statement eluded me before:
>>
>> > User-enabled adjustments: Dell's software development kit, or SDK,
>> enables
>> > customers with a proprietary colour solution to customize Dell
>> UltraSharp
>> > Monitors with their preferred specifications. You can also fine-tune
>> colour
>> > parameters, including RGBCMY saturation,RGBCMY hue, RGB and RGB offset.
>>
>> It surely does not mean that there's a CD in the box, somewhere,
>> containing an "SDK" for you or the casual color management hobbyist to get
>> into programming the display directly?
>>
>> / Roger
>>
>> -----Original Message-----
>> From: colorsync-users <colorsync-users-bounces+graxx=
>> email@hidden> On Behalf Of Wire ~ via colorsync-users
>> Sent: January 4, 2020 5:58 PM
>> Cc: 'colorsync-users?lists.apple.com' List <
>> email@hidden>
>> Subject: Re: NEC PA271Q "Native" chromaticities
>>
>> On Sat, Jan 4, 2020 at 2:44 PM Roger Breton via colorsync-users <
>> email@hidden> wrote:
>>
>> > Wire,
>> > Do you mind posting a scan (photo) of that certificate?
>> >
>>
>> I added the report:
>>
>> https://drive.google.com/open?id=1DSpUzIAgxsiG8qi8FKr2uJ5_P4MNmTKu
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