Shooting with Looks
Deciding on a creative look in pre-production will help you in the long run. Everybody can see the intended look early while shooting and during the edit, which can help getting around long discussions in color grading. You can create an AMIRA Look directly in the camera, or with our free AMIRA Color (Mac only), or color grading software to create a custom 3D LUT and convert it into the camera format using the AMIRA Color Tool.
There are two ways a look can be used on an AMIRA:
- Record the image including the look. The look is then burnt-in and inseparable from the footage.
- With a creative look, the image can then be used right away and without further correction.
- With a technical look, you can adapt the camera e.g. to capture more details in the highlights.
- Apply the look only on the monitoring output. The image is recorded in Log C and the look is stored in the footage metadata from where it can be extracted. This is a non-destructive look workflow, so any decision regarding the look is fully reversible.
Anatomy of an AMIRA Look
The default look of an AMIRA is Rec 709 video, which can be customized by applying ASC CDL image transforms and/or a 3D LUT. To understand how a look can affect the output, we need to follow the image through the camera.
Following white balance and the Log C encoding of the image, the first part of an AMIRA look are the image transforms slope, offset, power, and saturation (in that order), as standardized by the American Society of Cinematographers in the ASC CDL. In the AMIRA, the ASC CDL transforms are applied to the Log C image before the image is transformed for display on a monitor.
Part two is a 3D LUT that controls the transformation of Log C data to the output color space (like Rec 709 video). The options for the 3D LUT are:
- Without adjustments, the camera uses the default ARRI 3D LUT to transform the input to Rec 709 video.
- Using Master Black Gamma, Gamma and Knee, Saturation and Saturation by Hue (6 color vectors) generates a custom 3D LUT with modified tone map curve and color transformations. These adjustment parameters are called Video Look Parameters.
- Importing a custom User 3D LUT from a color grading tool provides more precision for color manipulations and allows the output to another color space, such as DCI P3.
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