ARRI ALEXA 35 Body & PL Mount Set (LBUS) User Manual
Page 44
Look Settings
44
LogC4
Images are output in LogC4 on the respective SDI output.
Wireless Video Optimized LogC4
Wireless video transmission systems use compression schemes optimized for
the final image video signal, such as Rec.709. When these transmission sys-
tems are used with a log signal (darker, lower contrast) and stretched to the
limits of their operating range, these compression methods may result in visual
artifacts that can be exacerbated by a log signal.
Wireless Video Optimized (WVO) LogC4 is an intermediate encoding for the
SDI outputs that is designed to improve monitoring image quality when trans-
mitting LogC4 over wireless video transmitters.
At the end of the transmission, the WVO LogC4 signal needs to be decoded
with a corresponding WVO LogC4 decoding LUT before applying any addition-
al color transforms like LUTs or CDLs. This decoding LUT can be loaded direct-
ly into the wireless receiver or become the first node in your on-set color work-
flow:
The result of the decoding LUT is a regular LogC4 signal that can be treated in
exactly the same way as having transmitted LogC4 to begin with.
Download the decode LUT from the ARRI website:
ATTENTION
Please note, that a WVO-encoded image without the decoding LUT is not
compatible with any LogC4 LUT or image analysis tools, such as a false
color display in a monitor. Judging images without the decoding LUT will
mislead and could result in serious exposure issues.
For further information please see the
Look
The active look is applied to the respective SDI output.
The applied processing is indicated by the processing icon in the status informa-
tion of the respective output.
User Buttons
SDI 1 Check LogC4
and
SDI 2 Check LogC4
support to temporarily set the re-
spective output processing to
LogC4
.
SDI Color Space
► Select
MENU > Image > Look > SDI 1 Color Space
► Select
MENU > Image > Look > SDI 2 Color Space
Following options are available:
REC 709 (SDR)
REC 2020 (SDR)
REC 2100 / PQ (HDR)
REC 2100 / HLG (HDR)