ARRI Forum

Hi

Question regarding export of a LUTs from ART, we are shooting on a Alexa 35, reading the material my understanding is the LUT library are log to log Luts and we need to use these with the ARRI_LogC4-to-gamma24_Rec709-D65_v1. to be able to view the material correctly when outputting a log signal?

When exporting a 3d lut from the ART does this include the logtolog Lut + the logc4-to-rec709, essentaily creating a concatitated lut?

Hi Steve,

Steve Evans wrote: Thu Jun 01, 2023 2:30 pm Question regarding export of a LUTs from ART, we are shooting on a Alexa 35, reading the material my understanding is the LUT library are log to log Luts and we need to use these with the ARRI_LogC4-to-gamma24_Rec709-D65_v1. to be able to view the material correctly when outputting a log signal?

-> That's correct, it's also possible to use the Rec 2100 / PQ LUT = ARRI_LogC4-to-St2084_1K_Rec2100-D65_DW100_v1_33 instead of the Rec 709 / SDR = ARRI_LogC4-to-Gamma24_Rec709-D65_v1-33. Both are "Display Render Transforms (DRT)" and the technical conversion.
The look itself is a "Creative Modification Transform (CMT)" and log-2-log. This can also be selected in-camera (ALEXA 35) independently for the SDI 1 and SD 2.

Steve Evans wrote: Thu Jun 01, 2023 2:30 pm When exporting a 3d lut from the ART does this include the logtolog Lut + the logc4-to-rec709, essentaily creating a concatitated lut?

-> No currently it's not included, please add one of our DRTs in the output of your mastering/grading tool.