A new feature in ALEXA SUP 3.0 is a film style matrix that can be applied to the Log C output. The matrix makes the color characteristics of the Log C image similar to negative film scanned on an ARRISCAN.
The matrix is most usefully applied when the data is previewed or converted with a print film emulation (PFE). This is the common workflow in Digital Intermediate where the PFE is applied as a 3DLUT in the display path.
Below you see the ALEXA Log C image without and with the film style matrix. You can also see both images rendered through a PFE on the left side. On the right side you see a scan from a contemporary color negative film rendered through the same PFE. Compare the images to each other and to the Rec 709 output of the ALEXA, which can be displayed on the right side too.
Only printer light adjustments (RGB offsets to the logarithmic images) where used to match the ALEXA image (this is the version labeled "LogC + Film Matrix (CC)") to the image from scanned negative film.