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Video LUT

Video LUT · screenshot coming soon

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What this node does

Video LUT runs your clip through a 3D lookup table — the industry-standard way to ship a fixed “look” (a film emulation, a show LUT, a creative grade). Pick a LUT file from your ComfyTV LUT library and it’s applied to every frame. It takes COMFYTV_VIDEO in and out and renders through ffmpeg’s lut3d filter. Because it re-encodes, it has a ▶ Run. The chosen file is resolved against the LUT resource library by name; if the name isn’t found the node raises an error rather than silently doing nothing. Leaving the file empty passes the clip through unchanged. To send the graded clip into native ComfyUI nodes, add a Bridge (see the Bridge guide).

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When to use it

  • Apply a consistent creative look across many shots
  • Emulate a film stock or camera-to-Rec.709 transform
  • Deliver a client’s supplied show LUT
  • Bake a finished grade into an output for review

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Parameters

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lut_file

The LUT file name to load from the ComfyTV LUT library (only the base file name is used). It must resolve to a real file in the library, otherwise the node errors out. Hald .png LUTs are not supported here — they need a second input; convert to .cube (or another lut3d-compatible format) instead, and the node will raise a clear error if you feed it a .png.

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interp

Interpolation method used to sample the 3D LUT between its grid points. Default tetrahedral. Options: tetrahedral, trilinear, nearest, pyramid, prism. tetrahedral is the usual high-quality default; nearest is fastest but blockiest.

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Outputs

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Tips

  • Manage LUTs from the ComfyTV resources/LUT library; this node only references files by name from there.
  • If you get a “not found” error, confirm the exact file name exists in the LUT library.
  • LUTs assume a specific input color space — a Rec.709 look LUT on log footage (or vice-versa) will look wrong. Match the LUT to your footage.
  • Video Color — build a primary grade before or instead of a LUT
  • Video Curves — hand-shape tones when no LUT fits
  • CDL Grade — a portable slope/offset/power grade that travels as numbers, not a table