“Create CLUT”， vintage film， 16×16×16 for smaller/faster files， cinematic teal-orange， warm/cool tones). Keep edits subtle and versatile for broader applicability. Non-destructive: Use layer masks or adjustment layers if needed。

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.， “cinematic”)， provide more details. ， 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.， 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.， my_custom_lut.cube). Preview if available， 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”， “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， 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.， 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.， 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，。

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