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32×32×32 or 64³ for higher accuracy — higher values create larger files but better precision). Output format: .cube (standard for Shotcut and most editors). Choose output folder and filename (e.g.。
vintage film， import your video clip. Add the LUT filter (Filters Video LUT). Load your exported .cube file. Apply and preview on your footage. Adjust strength/opacity if needed. Test on multiple clips/frames and iterate back in GIMP if the mapping needs refinement (e.g.， cinematic teal-orange， my_custom_lut.cube). Preview if available， warm/cool tones). Keep edits subtle and versatile for broader applicability. Non-destructive: Use layer masks or adjustment layers if needed， “cinematic”)， Nice one Ben. I use GIMP and have just done a quick Grok alternative if anyone is interested. I haven’t tested yet Alternative Process Flow Using GIMP (Free Open-Source)GIMP (with the G’MIC plugin) offers a powerful， stronger/weaker adjustments). Tips and Notes This GIMP + G’MIC workflow produces comparable results to the Affinity method in the video but stays entirely free and open-source. Experiment with different gradings to build your own LUT library! If you run into plugin installation issues or need help with a specific look (e.g.， “3D LUT”， then generate/apply. G’MIC computes the 3D color mapping and saves the .cube file. forum.shotcut.org +1 Test and import into Shotcut: Open Shotcut，。
“Create CLUT”。
provide more details. ， 16×16×16 for smaller/faster files， but flatten/merge visibility for G’MIC input if required. Generate the LUT with G’MIC: Go to Filters G’MIC-Qt… (or wherever G’MIC appears after installation). Navigate to Colors category (search or browse for “CLUT”。
free alternative to Affinity Photo for creating .cube LUTs. G’MIC provides dedicated tools to generate accurate 3D color lookup tables by comparing a “before” (neutral) layer to an “after” (graded) layer. This method is commonly recommended in Shotcut communities and works well for video grading. forum.shotcut.org +2 Prerequisites Step-by-Step Process Flow Prepare a neutral base image: Open GIMP and create/open a representative image (ideally a photo frame from your video footage or a standard neutral color grid/chart for accurate color mapping). Recommended: Download or create a neutral LUT test chart (search for “neutral 3D LUT grid PNG” or generate a multi-color ramp/gradient image covering a wide RGB range). A good starting size is 512×512 or larger. Set up Before and After layers: Duplicate the base layer (Layer Duplicate Layer). Name the bottom layer “Before” (keep it neutral/original). Name the top layer “After”. Apply color grading to the “After” layer: Select the “After” layer. Use GIMP’s built-in tools under Colors menu: Curves (for contrast/S-curve). Levels. Hue-Saturation. Color Balance (highlights/midtones/shadows). White Balance or Brightness-Contrast. Experiment to achieve your desired look (e.g.， or specifically “CLUT from Before and After Layer” / similar exact name like “Create CLUT (Before/After)” — common in G’MIC). Select: Before layer: The neutral one. After layer: The graded one. Set parameters: Grid resolution/size (e.g.。