INSTALLATION AND OPERATION GUIDE
158 | XIP-3901
Figure 111
Scene-light SDR to HDR conversion
Scene-
light conversions are also useful for HDR to SDR conversion, where the desire is to match the “look” of a
traditional SDR camera. For example, the LUT 12 (scene-light conversion from BT.2100 HLG to SDR BT.709)
should be used when a BT.2100 HLG production is required to provide an SDR BT.709 output that closely
resembles the “look” of a traditional SDR BT.709 camera; perhaps for intercutting with SDR BT.709 cameras
covering the same event in SDR.
More details can be found in section 7.1.3 of ITU-
R report BT.2408, “Guidance for Operational Practices in HDR
Television Production”.
2 illustrates the recommended conversions for a range of different signal types and applications.
Table
2
– Recommended Conversions and LUTs
BBC LUT
Conversion Type
SDR to HDR
HDR to SDR
HDR to
HDR
Scene-
Light
Display
-Light
Direct
Mapping
Up-
Mapping
Down-
Mapping
Trans-
code
Gra
d
ed Con
tent
SDR graded inserts
5
SDR graded programs
3
HLG graded content
8
PQ graded content
1 or 2
Ca
m
er
a to
switcher
SDR BT.709 camera
6
S-Log3 camera
10
"S-Log3 Live" camera
11
Ca
m
er
a
to
SDR
sha
di
ng
HDR only camera
8 or 12
Gra
ph
ics
SDR matching color
branding
3
SDR matching in-vision
signage
4
Pr
o
g
ra
m
O
utput
SDR complete program
8
SDR "Clean Feed" for
mixing with unilateral and
ISO SDR cameras
12
PQ for onward distribution
7
SDR BT.709
signal
BT.709
Inverse OETF
BT.709
to BT.2020
Colour
SDR BT.709
scene-light
Gain
Adjustment
for BT.2408
levels
BT.2100
HLG OETF
HDR scene light
HDR BT.2100
HLG signal
SDR BT.2020
scene-light
Optional
highlight
expansion
