ALEXA 35 SUP 1.0.3 Release Notes
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All data subject to change without further notice.
LogC4 Curve
ALEXA 35 uses a new log curve, LogC4, to capture the increased dynamic range of the camera. The new curve requires
new LogC4 Look Up Tables (LUTs), which can be downloaded from the ALEXA 35 website, and which are included in
the ARRI Reference Tool (ART) and many third-party tools. Please note that images in LogC4 look darker than LogC3
images, that is normal.
Existing LogC3 LUTs cannot be used with LogC4 images.
ARRI Textures
ARRI Textures provide a new and unique way for cinematographers to exert greater creative control on set. A texture
defines the amount and character of grain in an image, as well as the amount of contrast at different levels of detail,
perceived by the viewer as sharpness. Previous ALEXA cameras were pre-programmed with a default texture, but with
ALEXA 35 you can choose from an evolving menu of custom ARRI Textures, either to suit a specific shooting
environment or to hone your look.
ARRI Textures can be chosen in-camera like Look files, like a film stock. The camera comes with several ARRI Texture
files pre-installed. There are different textures for different shooting situations: skin, night, vintage, higher contrast,
etc. Textures are always baked in for ARRIRAW and Apple ProRes and cannot be changed in post. For more
information, see the “ARRI Textures” white paper at
www.arri.com/alexa-35
.
The differences between ARRI Textures are subtle, therefore testing in pre-production with a large, high quality HDR
monitor is advised. The names of ARRI Textures reveal the basic characteristics:
Improved Look Handling
While ARRI Textures and the Enhanced Sensitivity Mode are baked into the image, color looks and the look intensity
setting are not. The camera always records images for Apple ProRes in LogC4 and for ARRIRAW in a log-like curve.
• The new ALF4 look files are Log-to-Log conversions and do not contain a color space conversion. The color space
conversion can be set in a separate step. This enables on-set viewing of SDR and HDR images of the same look.
• Look intensity can be adjusted in camera and is saved in metadata.
• A new LogC4 Look Library is built into the camera for free.
