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LUTs and Log, explained from the pipeline.
These guides are written by the people who build LUTLINE's render graph. They explain what a LUT actually does, why Log footage has to be converted before a creative look is applied, and how to get a clean grade on an iPhone — without marketing language or unverifiable claims.
Fundamentals
What is a LUT?
A look-up table maps every input color to an output color. Here is how 1D and 3D LUTs work, and why technical and creative LUTs are different tools.
Read the guideWorkflow
How to use LUTs on iPhone
Import a clip, convert the Log, correct, choose a look, export. The order that works, with your own .cube files included.
Read the guideLog conversion
Apple Log to Rec.709
Why iPhone Log looks flat, what Apple's official conversion LUT does to mid-gray and highlights, and why two apps can render the same clip differently.
Read the guideLog conversion
D-Log M to Rec.709
Convert drone and action-camera D-Log M with DJI's official table on iPhone, and learn how the _D file name identifies the profile after a Photos import.
Read the guideFundamentals
LUT vs. filter
A LUT is a portable color table; a filter is whatever an app decides. The differences that matter for video, in one table.
Read the guideReference
The .cube format
TITLE, LUT_3D_SIZE, DOMAIN_MIN, the red-fastest data order, and the mistakes that make a .cube file fail to load.
Read the guideFree to start · No account
Grade your next clip in the order a colorist works.
Import a video, let LUTLINE convert the Log, choose a look, and export the grade you previewed. The Free tier exports at 1080p or 2K with no watermark.