color-grade

原文涵盖的主题

• Color grade (LUTs via ffmpeg)
• "Make a few looks and let me choose"
• Bake a look into a reusable LUT
• Where grading sits in a pipeline
• Gotchas

Full Production Studio note: this skill drives the toolkit in agamm/video-agent. Clone that repo and run your agent inside it for the scripts/paths below to work; the guidance itself is usable anywhere. Grade through LUT files rather than re-deriving filter params each time. Two LUT formats, both native to ffmpeg, no extra deps: .cube — a 3D LUT (what colorists ship). Applied with lut3d. .png HALD-CLUT — a look baked from a filter chain (below). Applied with haldclut. The grade command auto-detects by extension. The best grading UX: render the SAME frame through several candidate looks into one labelled contact sheet, show it, let the user pick — then apply the winner to the whole video. none = the ungraded original (always include it for reference). Pick a frame (--at) with skin tones + a bright and a dark area so the grade's effect is visible. Author a look as a color-filter chain, then bake it into a HALD LUT once so it's reusable and fast to apply: This runs an identity HALD-CLUT through the chain → a .png LUT. Use available filters only — this ffmpeg is LGPL, so no eq (and no drawtext). Grade with: curves (the workhorse — per-channel tone curves), colorbalance (shadows/mids/hi

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