<s>
High-dynamic-range	B-Application
television	I-Application
(	O
HDR	O
or	O
HDR-TV	B-Application
)	O
is	O
a	O
technology	O
that	O
improves	O
the	O
quality	O
of	O
display	O
signals	O
.	O
</s>
<s>
It	O
is	O
contrasted	O
with	O
the	O
retroactively-named	O
standard	B-Device
dynamic	I-Device
range	I-Device
(	O
SDR	B-Device
)	O
.	O
</s>
<s>
Not	O
all	O
HDR	B-Application
displays	I-Application
have	O
the	O
same	O
capabilities	O
,	O
and	O
HDR	O
content	O
will	O
look	O
different	O
depending	O
on	O
the	O
display	O
used	O
,	O
and	O
the	O
standards	O
specify	O
the	O
required	O
convertions	O
depending	O
on	O
display	O
capabilities	O
.	O
</s>
<s>
HDR-TV	B-Application
was	O
first	O
used	O
in	O
2014	O
to	O
enhance	O
videos	O
,	O
and	O
it	O
is	O
now	O
also	O
available	O
for	O
still	O
pictures	O
.	O
</s>
<s>
HDR-TV	B-Application
is	O
a	O
part	O
of	O
HDR	O
imaging	O
,	O
an	O
end-to-end	O
process	O
of	O
increasing	O
the	O
dynamic	O
range	O
of	O
images	O
and	O
videos	O
from	O
their	O
capture	O
and	O
creation	O
,	O
to	O
their	O
storage	O
,	O
distribution	O
and	O
display	O
.	O
</s>
<s>
HDR-TV	B-Application
also	O
improves	O
color	O
gamut	O
,	O
as	O
Rec	O
.	O
</s>
<s>
Standard	B-Device
dynamic	I-Device
range	I-Device
(	O
SDR	B-Device
)	O
is	O
still	O
based	O
on	O
and	O
limited	O
by	O
the	O
characteristics	O
of	O
older	O
cathode	B-Device
ray	I-Device
tubes	I-Device
(	O
CRT	O
)	O
,	O
despite	O
the	O
huge	O
advances	O
in	O
screen	O
and	O
display	O
technologies	O
since	O
CRT	O
's	O
obsolescence	O
.	O
</s>
<s>
SDR	B-Device
formats	O
are	O
able	O
to	O
represent	O
a	O
maximum	O
luminance	O
level	O
of	O
around	O
100	O
nits	O
.	O
</s>
<s>
The	O
most	O
common	O
SDR	B-Device
formats	O
are	O
limited	O
to	O
the	O
Rec	O
.	O
</s>
<s>
They	O
can	O
constrain	O
themselves	O
to	O
the	O
limits	O
of	O
SDR	B-Device
even	O
if	O
the	O
content	O
is	O
delivered	O
in	O
an	O
HDR	O
format	O
.	O
</s>
<s>
The	O
color	O
dynamism	O
and	O
wider	O
range	O
of	O
colors	O
frequently	O
attributed	O
to	O
HDR	B-Application
video	I-Application
is	O
actually	O
a	O
consequence	O
of	O
a	O
WCG	O
.	O
</s>
<s>
While	O
HDR	B-Application
displays	I-Application
typically	O
have	O
WCGs	O
and	O
displays	O
with	O
WCGs	O
are	O
usually	O
capable	O
of	O
HDR	O
,	O
one	O
does	O
not	O
imply	O
the	O
other	O
;	O
there	O
are	O
SDR	B-Device
displays	O
with	O
WCGs	O
.	O
</s>
<s>
Regardless	O
,	O
when	O
a	O
WCG	O
is	O
available	O
on	O
an	O
HDR	B-Application
display	I-Application
,	O
the	O
image	O
as	O
a	O
whole	O
can	O
be	O
more	O
colorful	O
due	O
to	O
the	O
wider	O
range	O
of	O
colors	O
.	O
</s>
<s>
More	O
subjective	O
,	O
practical	O
benefits	O
of	O
HDR	B-Application
video	I-Application
include	O
more	O
realistic	O
luminance	O
variation	O
between	O
scenes	O
(	O
such	O
as	O
sunlit	O
,	O
indoor	O
,	O
and	O
night	O
scenes	O
)	O
,	O
better	O
surface	O
material	O
identification	O
,	O
and	O
better	O
in-depth	O
perception	O
,	O
even	O
with	O
2D	O
imagery	O
.	O
</s>
<s>
Some	O
HDR	O
formats	O
(	O
such	O
as	O
Dolby	B-Device
Vision	I-Device
and	O
HDR10+	B-Device
)	O
allow	O
the	O
content	O
creator	O
to	O
choose	O
how	O
the	O
adjustment	O
will	O
be	O
done	O
.	O
</s>
<s>
Other	O
HDR	O
formats	O
(	O
such	O
as	O
HDR10	B-Device
and	O
hybrid	O
log	O
–	O
gamma	O
(	O
HLG	O
)	O
)	O
do	O
not	O
offer	O
this	O
possibility	O
,	O
so	O
the	O
content	O
creator	O
's	O
intents	O
are	O
not	O
ensured	O
to	O
be	O
preserved	O
on	O
lower	O
capable	O
displays	O
.	O
</s>
<s>
Dolby	B-Device
Vision	I-Device
IQ	I-Device
and	O
HDR10+	B-Device
Adaptive	O
adjust	O
the	O
content	O
according	O
to	O
the	O
ambient	O
light	O
.	O
</s>
<s>
Since	O
2014	O
,	O
multiple	O
HDR	O
formats	O
have	O
emerged	O
including	O
HDR10	B-Device
,	O
HDR10+	B-Device
,	O
Dolby	B-Device
Vision	I-Device
,	O
and	O
HLG	O
.	O
</s>
<s>
Dolby	B-Device
Vision	I-Device
and	O
HDR10+	B-Device
include	O
dynamic	O
metadata	O
while	O
HDR10	B-Device
and	O
HLG	O
do	O
not	O
.	O
</s>
<s>
The	O
dynamic	O
metadata	O
are	O
used	O
to	O
improve	O
image	O
quality	O
on	O
limited	O
displays	O
that	O
are	O
not	O
capable	O
of	O
reproducing	O
an	O
HDR	B-Application
video	I-Application
to	O
its	O
fullest	O
intended	O
extent	O
.	O
</s>
<s>
The	O
HDR10	B-Device
Media	O
Profile	O
,	O
more	O
commonly	O
known	O
as	O
HDR10	B-Device
,	O
is	O
an	O
open	O
HDR	O
standard	O
announced	O
on	O
27	O
August	O
2015	O
by	O
the	O
Consumer	O
Technology	O
Association	O
.	O
</s>
<s>
It	O
is	O
the	O
most	O
widespread	O
of	O
the	O
HDR	O
formats	O
,	O
and	O
is	O
not	O
backward	B-General_Concept
compatible	I-General_Concept
with	O
SDR	B-Device
displays	O
.	O
</s>
<s>
It	O
is	O
technically	O
limited	O
to	O
a	O
maximum	O
peak	O
brightness	O
of	O
10,000	O
nits	O
;	O
however	O
,	O
HDR10	B-Device
content	O
is	O
commonly	O
mastered	O
with	O
a	O
peak	O
brightness	O
between	O
1000	O
and	O
4000	O
nits	O
.	O
</s>
<s>
HDR10	B-Device
lacks	O
dynamic	O
metadata	O
.	O
</s>
<s>
On	O
HDR10	B-Device
displays	O
that	O
have	O
lower	O
color	O
volume	O
than	O
the	O
HDR10	B-Device
content	O
(	O
such	O
as	O
lower	O
peak	O
brightness	O
capability	O
)	O
,	O
the	O
HDR10	B-Device
metadata	O
provides	O
information	O
to	O
help	O
the	O
display	O
adjust	O
to	O
the	O
video	O
.	O
</s>
<s>
Dolby	B-Device
Vision	I-Device
is	O
an	O
end-to-end	O
ecosystem	O
for	O
HDR	B-Application
video	I-Application
,	O
and	O
covers	O
content	O
creation	O
,	O
distribution	O
,	O
and	O
playback	O
.	O
</s>
<s>
Dolby	B-Device
Vision	I-Device
certification	O
requires	O
displays	O
for	O
content	O
creators	O
to	O
have	O
a	O
peak	O
luminance	O
of	O
at	O
least	O
1,000	O
nits	O
.	O
</s>
<s>
HDR10+	B-Device
,	O
also	O
known	O
as	O
HDR10	B-Device
Plus	I-Device
,	O
is	O
an	O
HDR	B-Application
video	I-Application
format	O
announced	O
on	O
20	O
April	O
2017	O
.	O
</s>
<s>
It	O
is	O
the	O
same	O
as	O
HDR10	B-Device
but	O
with	O
the	O
addition	O
of	O
a	O
system	O
of	O
dynamic	O
metadata	O
developed	O
by	O
Samsung	B-Application
.	O
</s>
<s>
It	O
has	O
been	O
positioned	O
as	O
an	O
alternative	O
to	O
Dolby	B-Device
Vision	I-Device
without	O
the	O
same	O
expenses	O
.	O
</s>
<s>
It	O
uses	O
the	O
HLG	O
transfer	B-Algorithm
function	I-Algorithm
,	O
Rec	O
.	O
</s>
<s>
The	O
format	O
is	O
backwards	B-General_Concept
compatible	I-General_Concept
with	O
SDR	B-Device
UHDTV	B-Device
,	O
but	O
not	O
with	O
older	O
SDR	B-Device
displays	O
that	O
do	O
not	O
implement	O
the	O
Rec	O
.	O
</s>
<s>
PQ10	B-Device
,	O
sometimes	O
referred	O
to	O
as	O
the	O
PQ	B-Algorithm
format	O
,	O
is	O
an	O
HDR	O
format	O
that	O
can	O
be	O
used	O
for	O
video	O
and	O
still	O
images	O
.	O
</s>
<s>
It	O
is	O
the	O
same	O
as	O
the	O
HDR10	B-Device
format	O
without	O
any	O
metadata	O
.	O
</s>
<s>
It	O
uses	O
the	O
perceptual	B-Algorithm
quantizer	I-Algorithm
(	O
PQ	B-Algorithm
)	O
transfer	B-Algorithm
function	I-Algorithm
,	O
Rec	O
.	O
</s>
<s>
HDR	O
Vivid	O
is	O
an	O
HDR	O
format	O
developed	O
by	O
the	O
China	O
Ultra	B-Device
HD	I-Device
Video	O
Alliance	O
(	O
CUVA	O
)	O
and	O
released	O
in	O
March	O
2021	O
.	O
</s>
<s>
Technicolor	O
Advanced	O
HDR	O
:	O
An	O
HDR	O
format	O
which	O
aims	O
to	O
be	O
backwards	B-General_Concept
compatible	I-General_Concept
with	O
SDR	B-Device
.	O
</s>
<s>
SL-HDR1	O
provides	O
direct	O
backwards	B-General_Concept
compatibility	I-General_Concept
by	O
using	O
static	O
(	O
SMPTE	O
ST	O
2086	O
)	O
and	O
dynamic	O
metadata	O
(	O
using	O
SMPTE	O
ST	O
2094-20	O
Philips	O
and	O
2094-30	O
Technicolor	O
formats	O
)	O
to	O
reconstruct	O
a	O
HDR	O
signal	O
from	O
an	O
SDR	B-Device
video	I-Device
stream	O
that	O
can	O
be	O
delivered	O
using	O
existing	O
SDR	B-Device
distribution	O
networks	O
and	O
services	O
.	O
</s>
<s>
SL-HDR1	O
allows	O
for	O
HDR	O
rendering	O
on	O
HDR	O
devices	O
and	O
SDR	B-Device
rendering	O
on	O
SDR	B-Device
devices	O
using	O
a	O
single-layer	O
video	O
stream	O
.	O
</s>
<s>
The	O
HDR	O
reconstruction	O
metadata	O
can	O
be	O
added	O
either	O
to	O
HEVC	B-Algorithm
or	O
AVC	B-Application
using	O
a	O
supplemental	O
enhancement	O
information	O
(	O
SEI	O
)	O
message	O
.	O
</s>
<s>
SL-HDR2	O
uses	O
a	O
PQ	B-Algorithm
curve	O
with	O
dynamic	O
metadata	O
.	O
</s>
<s>
UHD	B-Device
Blu-ray	I-Device
(	O
means	O
HDR10	B-Device
with	O
further	O
restrictions	O
)	O
SDR	B-Device
displays	O
supporting	O
Rec	O
.	O
</s>
<s>
2020	O
(	O
such	O
as	O
UHD-TV	O
)	O
NotesPQ10	O
format	O
is	O
same	O
as	O
HDR10	B-Device
without	O
the	O
metadataTechnical	O
characteristics	O
of	O
Dolby	B-Device
Vision	I-Device
depend	O
on	O
the	O
profile	O
used	O
,	O
but	O
all	O
profiles	O
support	O
HDR	O
with	O
Dolby	B-Device
Vision	I-Device
dynamic	O
metadata.HLG	O
backward	B-General_Concept
compatibility	I-General_Concept
is	O
acceptable	O
for	O
SDR	B-Device
UHDTV	B-Device
displays	O
that	O
can	O
interpret	O
the	O
BT.2020	O
colour	B-Algorithm
space	I-Algorithm
.	O
</s>
