Hey this is Tyler from SpectraCal now a part of Portrait Displays in this video
I'm going to walk you through our new HDR 10 calibration workflow the
workflow is intended for calibration and measurement of HDR 10 compatible TVs
have opened the workflow is the splash page
the next page is where we connect our hardware I've already connected our
SpectraCal 6 and quantum data 780 pattern generator
now we need to enable HDR 10 mode so i'm going to go here and click HDR 10 and
that's going to send the proper metadata via hdmi to the TV to kick it into HDR
mode that we default to 1000 knits and p3 color gamut of the mastering display
you can put in your own metadata values if you want to evaluate how your
television behaves with different HDR 10 metadata
we recommend using a 10-percent window pattern. This applies to both lcds and oh
let this is also the same size that the ultra HD Alliance uses in their testing
protocols the next page is our pre calibration view this should be pretty
familiar to you if you use CalMAN before we try to keep the mechanics of the
calibration very similar to an SDR calibration some of the graphs might be
scaled a little different or have different labels but you should be
pretty familiar with the process.
I'm going to do a read series so we can see what it's doing right now
now we've measured both our color gamut and the gray scale the next page in the
workflow is a 2-point white balance page since HDR 10 is the new technology
different manufacturers of the televisions have implemented controls
differently and so there are some different behavior some displays you
would do too . White balance some you don't
so there's going to be a kind of learning curve for the whole calibration
community to figure out the best way to calibrate each of the manufacturers
so this is our too . White balance the next page is the multi-point gray scale
now this should look pretty familiar but we do have these two new graphs instead
of a gamma graph we have an e 0 TF graph which stands for electro optical
transfer function which in this case we're using st 2084 which is the
transfer function that's used for HDR 10
once I take some measurements all all explain what we see in this graph and we
also have this peak luminous graphs you can see an easy representation of how
bright that your HDR 10 TV actually is so i'm going to do a read series and then
afterwards I'm going to explain what these new graphs are showing
so the OTF graph it's pretty much following right along as t24 if it was
any of these points were under luminance the line would come down below this line
if it was over luminance at that point it would be above and then near the top
this is the highlight roll off feature so each manufacturer is doing the roll
off a little bit differently it's not a standard yet the ITU is working on a
standard how and at what rate you should roll off the highlights
you don't want too hard clip anything so each manufacturers kind of doing things
a little bit differently so we can't have an actual roll off standard to
measure against at the very top until the ITU comes out with their
recommendation
so that's what we're seeing right here and right here so you can see it's
following the st 2084 curve very nice and tell the Roloffs starts in the
normal RGB balance chart in this area is a little bit hot / luminance and then
this is where the Roloffs starts so this is normal looking don't be freaked out
because this is a big spike down
this is just where the Roloffs starts happening and you can see the peak
luminance of this particular HDR 10 display is 515 it's more about 547 the
next page is our color management page. Now by default
previously we would measure a hundred percent saturation in in SD our
calibration that's what we've always been calibrated rec 709 and our regular
calibrations are now considered SDR it's kind of like we never knew we're
watching standard def TV until high-def TV came out it was just TV before that
then we had a high definition then we started calling the previous thing
standard definition so SDR a standard dynamic range versus HDR which is high
dynamic range
so since our color space for HDR 10 is Rec 2020 and no displays can
actually hit Rec 2020
save for something like RGB laser projector
because Rec 2020 primaries are single wavelength of light
that's why they're on the spectral locus right here that's the very edge each one
of the primaries is actually a single wavelength of laser light
we're not gonna be able to hit that with a flat panel most of the displays can
cover some percentage of rec 2020
so we've set this up to measure rec 2020 at fifty percent saturation
and fifty percent luminance because we did a hundred percent luminance that
would be equal to ten thousand minutes because st 24 hundred percent signal is
10,000 it so whatever the color representation of that would be so we
can measure it at a hundred percent saturation hundred percent illuminates
so we're we're doing something that most displays can hit which is fifty percent
saturation and fifty percent luminance I'll run a quick read series and then I
want to show you some new features we've added to our saturation sweeps that I
think people are really going to like this layout what we call a workflow page
layout
this is actually a saturation suite page that I've selected fifty percent
saturated fifty percent luminance on
but there are some alternative ones that you can pick that I think people will be
kind of excited about so I'll show you that after i take the measurements
ok so you can see this is our fifty percent saturation we got pretty good
Delta T's are all about 3 or under
but the alternative saturation sweet I want to talk about is we added something
we're even though we're set direct 2020 in here under work for basic options
were set to Rec 2020s - 2084
so that's our target we added a new feature in our saturation sweeps
so I can go to work for basic options here go to saturation sweeps and i can
pick DC ip3 based sweeps inside of Rec 2020 and signaled as Rec 2020
so you can see how it tracks DCI p3 saturations and primaries inside of a
Rec 2020 container
let me switch this to twenty percent as many people have heard and there's been
a lot of buzz about it even though we are signaling Rec 2020 the mastering
displays that have been mastering the HDR content in the at the studios their
most of their gamut is p3 but since p3 is in a standard for home video at all
we're kind of transporting that p3 data in a wreck 2022 container signaled as
Rec 2020 RGB triplet
this right here is the p3 red signaled as a Rec 2020 triplet it has the X Y Z
value of the p3 read but signaled in Rec 2020 triplets
I can show you how what the results would be when i run this kind of an
interesting test
so now we ran our sweeps you can see it follows the p three primary saturation
sleep inside the Rec 2020 pretty well until it has to clip because it doesn't
this display does not do a hundred percent of p3 I think it does somewhere
around ninety percent or a little over ninety percent so you can see also it
follows the green primary of p3 Intel it can't hit a hundred percent of p3 also
the blue primary you can see the native blue primary of this display is actually
outside of rec 2020
but it's not all the way over to the spectral locus so it's further down but
it's not the rec 2020 blue
so that's why when it gets to the edge it has to start going towards the native
primary so it can follow and then it starts to go towards the native primary
one other thing that we've added for saturation sweeps for HDR or you can use
it for SDR as well is Rec 2020 contained Rec 709 saturation sweeps as
well so i can go here and i can do the same test but with rec 709 to see how
Rec 709 signaled colors in and wrecked 2020 container would actually behave so
i could do a saturation sweep for the rec 709 primaries
ok now that we've ran through our CMS here this is our post calibration
settings after you did your cuts and gamut 10 . Our CMS adjustments you
would document those and then the next thing would be to do our color checker
in the color checker all these values are signals directly 20 but they're all the
color checker SDR content we felt that since most of the content in HDR even
though it can be much wider color gamut and brighter that most of the content
and in the movie will be in the rec 709 area and in the hundred knit range and
then you know you'll just get explosions and another really wide stuff more
sparsely throughout the content and we also have the DCI P3 primaries in
this color checker and then the colorchecker the data from here will be
populated into the report
so I'm gonna run a read series
now that I've done the colorchecker we have saturation suite page
it's already configured the other one was just configured for the fifty
percent and fifty percent
this one is set up for the rec 2020 sweeps we just thought it would be
easier so you don't have to keep going on the menu to include both of them so
i'm just going to leave this blank since we already covered the different
saturation sweep options
so now is our post calibration view this is where you would take your
measurements to see how accurate your display is after you did all the
calibration now I'm just kind of walking through these pages i didn't show you
the calibration process will be showing more videos like that
so we're pretty much going to have the same results are pre calibration
measurements but this will be populated into our new home
HDR report so let me run to read series really quick so we can populate that
data and then I can launch the home HDR report to show you that because the
existing home report the graphs are configured correctly for HDR so we
wanted to give you guys something that you can post online
ok so now i'm gonna go to view report save session and view report
so this is our new HD our home report
so it shows RGB balance re OTF graph Delta is of the gray scale and then our
color checker results
one cool thing about this report and the reason that it's not labeled the CalMAN
HDR 10 home report is because it's also compatible with the Dobe Vision
workflow currently the enthusiast license doesn't get the professional
Dobe Vision report so we wanted to give you an alternative for the home user so
this report is compatible with both the HDR 10 workflow and the Dobe Vision
workflow
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