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 required 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 desaturated
when displayed on standard broadcast monitors.
ALEXA preview LUTs can easily be generated
using the ARRI LUT Generator, a web application
available on www.arridigital.com.
REC 709 REC 709 is a video display gamma that complies
with the ITU.R-BT709 standard. REC 709 images
can be displayed on standard broadcast monitors.
Note: In High Speed mode, a gamma setting cannot be applied to the REC OUT
as the MON OUT output path is rerouted to REC OUT.
ARRI Look Files
ARRI Look 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 Look 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 contains one preloaded Look File called Low Contrast Curve
(LCC). This Look File contains a custom tone map curve that creates a
video image with lower contrast compared to the standard REC 709
output. As a result, the image holds as much dynamic range
information as possible, without using LOG C encoding. Highlight and
shadow detail that would be lost in the typical REC 709 tone mapping
can still be accessed.
ARRI LOOK Creator, a free application from ARRI, and some third-party
applications can be used to create ARRI Look Files from DPX-format
frame grabs taken on the ALEXA.
To apply a Look File:
1. On the HOME screen, press the COLOR button.
2. Press the SET LOOK button.
3. Using the jogwheel, select a Look File from the list on the LOOK
FILES screen. The default preloaded Look File is LCC.
4. Press the jogwheel to set the Look File.
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