How do I load 3D LUTs (Arri Look Files) for Monitoring with the Arri Alexa?

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Introduction

First consult your camera documentation in regards to support of loading Arri Look files. Not all cameras in the Arri range support live monitoring using LUTs, so make sure your camera does before trying the following procedure. We’ll demonstrate the procedure of loading monitoring LUTs on the Arri Alexa Mini.

Loading Arri Look files for monitoring purposes with Arri Alexa

First make sure that the USB thumb drive that came with your camera is ready for use. The folder structure on the thumb drive should look similar to the following image. Please note, the folder structure tree is expanded in this picture on a MacOS.

arri-alexa-mini-usb-thumb-folder-structure

If your folder structure differs or if your thumb drive is empty you’ll have to format it in camera.

In order to format the USB thumb drive, place it in the slot behind the rear door underneath the CFast 2.0 card slot (in case of Alexa Mini). In the camera’s menu, navigate to Menu > Media > Prepare USB medium and select Confirm.

menu-media

prepare-usb-media

You should see a message that the folder structure was created successfully.

We are now ready to copy the Arri Look files from your Lutify.me package to the USB thumb drive. Please note that the name of the Arri Look file including the .aml file extension cannot be longer than 28 characters. If you haven’t renamed any of our Arri Look files you should be good to go. In case you have renamed the files, make sure that their names are less than 28 characters.

You may have to rename some of the ‘Movies Inspired Looks’ .aml files from your package to have less than 28 characters in their name.

Connect the drive to your computer and copy the Arri Look files into the following folder (in case of Alexa Mini):
ARRI > A-MINI > LOOKFILES

Once copied, eject the drive, and connect it to the camera.

To load your custom look file and set it as the active look, which can be applied to any of the “Rec” (internal recording), “SDI” (monitor out) or “EVF/Mon.” (the camera’s eyepiece and flip-out LCD monitor) signal paths, on the camera’s flip out menu interface, do the following:

Look > Edit > Add > Select > Back > Set

look-button

look-edit

look-add

Next, assign the current loaded Look to the EVF/Mon option, if it isn’t already, in order to see your custom look in the camera’s EVF (or on the SDI monitor out if you are using a monitor connected via SDI).

If the Look file you are loading isn’t a drastic change from the regular Rec.709 image it may be hard to see the difference. We suggest first trying the procedure with a drastic Look file so the change in the EVF and SDI monitor is evident (to be sure you have loaded the Look file correctly) and than repeating the procedure for the Look file you would actually like to monitor with.

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