<s>
Standard-dynamic-range	O
(	O
SDR	O
)	O
video	O
is	O
a	O
video	O
technology	O
which	O
represents	O
light	O
intensity	O
based	O
on	O
the	O
brightness	O
,	O
contrast	O
and	O
color	O
characteristics	O
and	O
limitations	O
of	O
a	O
cathode	B-Device
ray	I-Device
tube	I-Device
(	O
CRT	B-Device
)	O
display	O
.	O
</s>
<s>
SDR	B-Device
video	I-Device
is	O
able	O
to	O
represent	O
a	O
video	O
or	O
picture	O
's	O
colors	O
with	O
a	O
maximum	O
luminance	O
around	O
100	O
cd/m2	O
,	O
a	O
black	O
level	O
around	O
0.1	O
cd/m2	O
and	O
Rec.709	B-Device
/	O
sRGB	O
color	O
gamut	O
.	O
</s>
<s>
It	O
uses	O
the	O
gamma	O
curve	O
as	O
its	O
electro-optical	B-Algorithm
transfer	I-Algorithm
function	I-Algorithm
.	O
</s>
<s>
The	O
first	O
CRT	B-Device
television	O
sets	O
were	O
manufactured	O
in	O
1934	O
and	O
the	O
first	O
color	O
CRT	B-Device
television	O
sets	O
were	O
manufactured	O
in	O
1954	O
.	O
</s>
<s>
The	O
term	O
"	O
standard-dynamic-range	B-Device
video	I-Device
"	O
was	O
adopted	O
to	O
distinguish	O
SDR	B-Device
video	I-Device
from	O
high-dynamic-range	B-Application
video	I-Application
,	O
a	O
new	O
technology	O
that	O
was	O
developed	O
in	O
the	O
2010s	O
to	O
overcome	O
SDR	O
's	O
limits	O
.	O
</s>
<s>
Opto-electronic	B-Algorithm
transfer	I-Algorithm
function	I-Algorithm
(	O
OETF	O
)	O
:	O
</s>
<s>
Electro-optical	B-Algorithm
transfer	I-Algorithm
function	I-Algorithm
(	O
EOTF	B-Algorithm
)	O
:	O
</s>
<s>
The	O
linear	O
part	O
of	O
the	O
conventional	O
gamma	O
curve	O
was	O
used	O
to	O
limit	O
camera	O
noise	O
in	O
low	O
light	O
video	O
but	O
is	O
no	O
longer	O
needed	O
with	O
high	B-Application
dynamic	I-Application
range	I-Application
(	O
HDR	B-Application
)	O
cameras	O
.	O
</s>
<s>
ITU-R	B-Algorithm
Recommendation	I-Algorithm
BT.1886	I-Algorithm
describe	O
the	O
reference	O
EOTF	B-Algorithm
of	O
SDR	O
.	O
</s>
<s>
It	O
's	O
a	O
gamma	O
curve	O
representing	O
the	O
response	O
of	O
CRT	B-Device
to	O
video	O
signal	O
.	O
</s>
<s>
A	O
transfer	B-Algorithm
function	I-Algorithm
that	O
is	O
closer	O
to	O
Weber	O
's	O
law	O
allows	O
for	O
a	O
larger	O
dynamic	O
range	O
,	O
at	O
the	O
same	O
bit	O
depth	O
,	O
than	O
a	O
conventional	O
gamma	O
curve	O
.	O
</s>
<s>
HDR	B-Application
standards	O
such	O
as	O
hybrid	O
log	O
–	O
gamma	O
(	O
HLG	O
)	O
and	O
SMPTE	B-Algorithm
ST	I-Algorithm
2084	I-Algorithm
allow	O
for	O
a	O
larger	O
dynamic	O
range	O
by	O
using	O
a	O
different	O
transfer	B-Algorithm
function	I-Algorithm
.	O
</s>
<s>
Rec.709	B-Device
/	O
sRGB	O
color	O
primaries	O
)	O
.	O
</s>
<s>
HDR	B-Application
uses	O
wide	O
color	O
gamut	O
(	O
WCG	O
)	O
such	O
as	O
Rec	O
.	O
</s>
<s>
SDR	B-Device
video	I-Device
with	O
a	O
conventional	O
gamma	O
curve	O
and	O
a	O
bit	O
depth	O
of	O
8-bits	O
per	O
sample	O
has	O
a	O
dynamic	O
range	O
of	O
about	O
6	O
stops	O
,	O
assuming	O
a	O
luminance	O
quantisation	O
threshold	O
of	O
5%	O
is	O
used	O
.	O
</s>
<s>
Professional	O
SDR	B-Device
video	I-Device
with	O
a	O
bit	O
depth	O
of	O
10-bits	O
per	O
sample	O
has	O
a	O
dynamic	O
range	O
of	O
about	O
10	O
stops	O
.	O
</s>
<s>
While	O
conventional	O
gamma	O
curves	O
are	O
useful	O
for	O
low	O
light	O
and	O
are	O
compatible	O
with	O
CRT	B-Device
displays	I-Device
,	O
they	O
can	O
only	O
represent	O
a	O
limited	O
dynamic	O
range	O
.	O
</s>
<s>
Standards	O
require	O
SDR	O
to	O
be	O
viewed	O
on	O
a	O
display	O
with	O
the	O
same	O
characteristics	O
as	O
a	O
CRT	B-Device
(	O
i.e.	O
</s>
<s>
However	O
,	O
current	O
displays	O
are	O
often	O
far	O
more	O
capable	O
than	O
CRT	B-Device
's	O
limits	O
.	O
</s>
<s>
HDR	B-Application
is	O
however	O
required	O
for	O
the	O
creative	O
intents	O
to	O
be	O
preserved	O
.	O
</s>
