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78 Camera Controls
Processing defines the type of processing that is applied to the image path. The
following list describes which image processing settings are available. Note that in
case of ARRIRAW recording, REC processing is always set to ARRIRAW and cannot
be changed.
Log C Log C is a logarithmic gamma based on the Cineon format for
output to film print or digital intermediate. Color-grading is a re-
quired post-production step in the Log C workflow. Standard
broadcast monitors cannot properly display Log C images so a
conversion look up table (LUT) is necessary for display, dailies
and editing proxies. Log C images will appear flat and desaturat-
ed when displayed on standard broadcast monitors. ALEXA pre-
view LUTs can easily be generated using the ARRI LUT Genera-
tor, a web application available on www.arri.com.
Look file The ARRI Look File 2 file that has been selected is applied on
the respective image path.
ALEXA Clas-
sic 709
The ALEXA performs an image processing that is similar to the
behavior of an ALEXA XT or ALEXA Classic with SUP 11.
This setting is mainly useful if a standard REC 709 conform im-
age should be output on the respective image path, but a more
creative ARRI Look File 2 file has been loaded, e.g. for record-
ing.
This setting is not available for internal recording.
MON OUT color spaces
The MON OUT color spaces screen allows to configure the color space for MON
OUT 1/2/3. This setting must match the color rendering capabilities of the connected
monitors, otherwise color clipping may occur.
ARRI Look File 2 files
ARRI Look File 2 files are a way for the user to alter the parameters the ALEXA uses
when converting the sensor image data to a video color space. This can be described
as applying a custom "look" to the different image output paths. The ARRI Look File 2
file can be applied directly to the recorded image (destructive workflow), or just to the
monitoring paths and included in the clip as metadata only (non-destructive workflow).
The ALEXA comes with several pre-installed ARRI Look File 2 files, including LCC
709, where LCC stands for Low Contrast Curve and 709 denotes the target color
space. This ARRI Look File 2 file contains a custom tone map curve that creates a
video image with lower contrast compared to the standard REC 709 output. As a
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