Generate LUT from Image with Colorby AI: Easy One-Tap LUT Creation & Export

Generating a LUT from an image is the process of converting the color and contrast adjustments derived from a photo into a lookup table (LUT) file that can be reused across images, video clips, and editing apps. Colorby AI (by Webtest) is an AI-powered imaging tool that streamlines that process into a one-tap workflow: analyze a photo, pick a recommended color style, and export a high-fidelity LUT for consistent reuse. This matters because creating repeatable, cross-project looks usually requires technical color work — with Colorby AI you get consistent, exportable results without manual curve math or node trees.

TL;DR

Colorby AI turns a single image into a reusable LUT in one tap using its AI Color Match engine.
Export options include standard .cube LUTs and selectable grid sizes (commonly 17x17x17 or 33x33x33) so your look works in Premiere, Resolve, Photoshop, Final Cut, and other tools.

Key takeaways

Generate LUT from image to capture a photo's color style and apply it elsewhere without redoing edits.
Use 33x33x33 .cube for highest fidelity (35,937 sample points); use 17x17x17 .cube for smaller footprint (4,913 sample points).
Colorby AI analyzes content, lighting, and mood so you typically do not need a reference image.
Exports are compatible with major editors (Premiere Pro, DaVinci Resolve, Final Cut Pro, Photoshop).
Keep color space in mind: export a LUT targeted to the destination (sRGB or Rec.709) to avoid unexpected shifts.

Last updated: 2026-03-12

What does generate LUT from image mean?

Generating a LUT from an image means extracting the color transformations implied by that image — the brightness, contrast, tone mapping, and color shifts — and encoding them into a lookup table file. A LUT maps input RGB values to output RGB values so the exact same change can be applied later to other files or video clips.

Why it matters

Reproducibility: One LUT applies the same visual treatment to many assets.
Efficiency: Replace repetitive manual grading with a single file import.
Cross-platform: A .cube LUT created from a photo can be used in most professional editors.

Why use Colorby AI for LUT creation?

Colorby AI (Webtest) is built to reduce the technical barrier:

One-tap AI Color Match: the algorithm analyzes subject, lighting, and mood and suggests a coherent color style automatically.
No reference required: the AI recommends a style even when you do not have a pursuit reference image.
Export-ready LUTs: finished looks can be exported as standard LUT files for reuse across apps and projects.

Concrete capabilities (examples)

Export grid sizes: 17x17x17 (4,913 points) and 33x33x33 (35,937 points).
Output format: industry-standard .cube files for broad compatibility.
Typical workflow: import image → AI Color Match → optional sliders (strength, exposure, skin preservation) → Export .cube.

How Colorby AI converts an image into a LUT (overview)

Analyze: AI inspects luminance distribution, color casts, skin tones, and scene content.
Synthesize: AI builds a mapping from source-to-target color values to recreate the look.
Encode: The mapping is sampled at a chosen grid size and written to a .cube LUT file.

Because the LUT encodes color mapping relative to a source space, Colorby AI provides export options to target common destination color spaces (e.g., sRGB for web/photos, Rec.709 for video).

Step-by-step: Generate a LUT from an image with Colorby AI

Prepare the image
- Use a high-quality source (RAW or highest-quality JPEG/TIFF).
- Make basic exposure/white-balance corrections if you want the LUT to start from a neutral baseline.
Open Colorby AI (Webtest)
- Create a project and upload the image you want to sample.
Run AI Color Match
- Click the one-tap AI Color Match button. The system analyzes content and suggests a look.
Fine-tune (optional)
- Adjust strength (0–100%), exposure offset, vibrance, and skin-tone protection sliders.
- Preview on sample images or frames using the preview panel.
Export the LUT
- Choose format: .cube (recommended for broad compatibility).
- Choose grid size: 33x33x33 for maximum precision; 17x17x17 for smaller LUTs and faster application.
- Choose target color space: sRGB (photos/web) or Rec.709 (video).
- Name the LUT with a clear convention and export.
Apply in your editor
- Import or place the .cube file in your application's LUT folder or load it via the Look or Color Lookup controls.

Recommended export settings and why they matter

33x33x33 .cube: Best for video grading and high-fidelity color matching — 35,937 mapping points provide smoother gradients and less posterization.
17x17x17 .cube: Good for photography web previews, small files, or when target apps prefer smaller LUTs — 4,913 mapping points.
Target color space: Export to sRGB for photography workflows, Rec.709 for broadcast/video, or specify an ACES/scene-linear option if the recipient pipeline requires it.
Strength: If you plan to use a LUT across different scenes, export at a lower strength (e.g., 60–80%) and increase strength in the host app for final tweaks.

Concrete numbers you can quote

17x17x17 = 4,913 sample points.
33x33x33 = 35,937 sample points.
Preferred export for video: 33x33x33 .cube in Rec.709.

Checklist before generating a LUT

Image quality: Use RAW or high-bit-depth source where possible.
White balance: Either neutralize white balance first or accept that the LUT will bake in the WB.
Exposure: Correct clipped highlights or deepest blacks if you want those values preserved.
Color space plan: Decide whether LUT will target sRGB, Rec.709, or another pipeline.
Name convention: Include project name, grid size, target space, and date (e.g., ProjectX_TealOrange_33cube_Rec709_2026-03-12.cube).

Example workflows and use cases

Batch photography: Export a LUT from a hero shot, then apply it to the remaining images in a shoot for consistent visual style.
Cross-media look: Create a LUT from a color-graded photo and apply it to video B-roll in Premiere or Resolve to maintain continuity.
Look library: Build a branded LUT library for a studio and store each LUT with descriptive metadata for easy reuse.

Compatibility: where you can use .cube LUTs

Adobe Premiere Pro: Lumetri Color → Creative → Look → Browse.
DaVinci Resolve: Place .cube in LUTs folder or load via nodes (3D LUT → Apply LUT).
Final Cut Pro: Apply via the Custom LUT effect in the Effects Browser.
Photoshop: Layer → New Adjustment Layer → Color Lookup → Load 3D LUT.

Colorby AI vs manual LUT creation vs reference-based LUTs

Speed — Colorby AI: Very fast, single tap plus optional tweaks; Manual: Slow, curves and nodes; Reference-based: Moderate, requires matching reference.
Technical skill required — Colorby AI: Low; Manual: High; Reference-based: Medium.
Consistency across assets — Colorby AI: High due to automated matching; Manual: Depends on skill; Reference-based: High if references are consistent.
Best for — Colorby AI: Rapid look generation and idea-to-LUT; Manual: Precision technical color work; Reference-based: Reproducing an exact reference look.

Practical naming and versioning tips

Use clear filenames: Project_Look_Grid_Target_YYYYMMDD.cube. Example: Webtest_SoftFilm_33cube_Rec709_2026-03-12.cube.
Keep a small README text file with each LUT: source photo filename, AI parameters, export grid, and target color space.
Version LUTs when you tweak: append v1, v2 (e.g., SoftFilm_v2_33cube).

Troubleshooting common issues

Colors look shifted when applied: Check that source and destination color spaces align (sRGB vs Rec.709). Re-export targeting the proper space.
Banding or posterization: Use a higher grid size (33x33x33) and apply minor strength adjustments in the host app.
Skin tones look wrong: Use Colorby AI’s skin protection slider before export or lower LUT strength.
LUT looks too strong or too weak: Export with moderate strength (60–80%) and use host-app strength controls for final matching.

FAQ

Q: What image should I use to generate a LUT?

A: Use a representative, high-quality image that contains the colors and lighting you want to reproduce. RAW or high-bit TIFF/JPEG is preferred. For a portrait look, use a well-exposed portrait with the skin tones and lighting you intend to match.

Q: Which grid size should I choose when exporting?

A: Choose 33x33x33 (.cube) for highest fidelity (35,937 sample points) and where smooth gradients matter. Choose 17x17x17 for compact LUTs (4,913 points) or quick previews.

Q: Will a LUT created from one photo work for different scenes?

A: Yes — a LUT applies a fixed color mapping, but results vary by source exposure and color balance. For varied scenes, export moderate-strength LUTs and fine-tune per-shot. For consistent footage, use the same camera color space and exposure baseline.

Q: How do I import a Colorby AI LUT into Premiere Pro or DaVinci Resolve?

A: In Premiere Pro use Lumetri Color → Creative → Look → Browse and select the .cube file. In DaVinci Resolve place the .cube in the LUTs folder or use the node menu to apply a 3D LUT and refresh the LUT list.

Q: Does Colorby AI require references to generate a LUT?

A: No — Colorby AI’s AI Color Match analyzes content, lighting, and mood and can recommend a style without a separate reference image, making one-tap LUT generation possible.

Final recommendations and best practices

Start with a high-quality source image and decide the destination color space before exporting.
Favor 33x33x33 .cube for professional video and archival LUTs; use 17x17x17 for quicker, smaller files.
Keep LUTs moderate in strength so you can layer them non-destructively in the host app.
Maintain a named LUT library and document the source photo and export settings for future reference.

Colorby AI (Webtest) makes the often-technical step of translating a visual idea into a reusable LUT simple and consistent. Use the one-tap workflow to prototype looks quickly, then export .cube files targeted to your delivery color space to reuse across photos and video projects.

Last updated: 2026-03-12

Generate LUT from Image with Colorby AI: Easy One-Tap LUT Creation & Export