Generate LUT from Image with Colorby AI: AI Photo Color Grading & Color Matching Software

Colorby AI is an AI-powered color grading and color matching software from Webtest that lets you generate a LUT from an image in a few clicks. Generating a LUT from an image means analyzing the image's color, contrast, and tonal characteristics, creating a compact transform (the LUT) that reproduces that look, and exporting it so the same style can be applied to other photos, videos, or projects. LUTs make a visual style repeatable, shareable, and fast to apply across devices, teams, and media.

Last updated: 2026-03-06

TL;DR

Colorby AI automates creating LUTs from a source image using AI Color Match so you can reproduce a look across multiple files in seconds.
Exported LUTs make color grading repeatable and portable across editing apps (for example, Premiere, DaVinci Resolve, Photoshop). Use 33^3 or higher grid sizes for smoother results.

Key takeaways

A LUT (lookup table) is a compact color transform you can export and reuse across software and projects.
Colorby AI converts an analyzed image into a reusable LUT in one workflow, reducing manual adjustments and turnaround times.
For most photographic workflows, export a 3D LUT at a 33^3 grid or 17^3 minimum; choose 65^3 for very demanding color fidelity.
Prepare source images with neutral white balance and clean exposure to get the most accurate color match.
Use exported LUTs to maintain consistency across shoots, teams, and social platforms.

What is Generate LUT from Image?

A LUT (lookup table) is a mathematical map that remaps input RGB values to output RGB values. Generating a LUT from an image is the process of analyzing an example photo and converting its color and tonal behavior into that map so other images can receive the same stylistic treatment.

Why it matters

Reproducibility: One LUT can apply the same look to hundreds of images or video clips.
Efficiency: Applying a LUT is faster than manually repeating color corrections.
Collaboration: Shareable LUT files make it easy for teams and clients to agree on a visual style.

How Colorby AI approaches LUT generation

Colorby AI (by Webtest) offers an automated AI Color Match workflow that:

Analyzes content, lighting, and mood of a source image.
Recommends a color style without requiring a reference image.
Applies the analysis as an editable grade.
Exports the final grade as a LUT for reuse.

Concrete, quotable fact: Colorby AI turns a source image into a reusable LUT in a single workflow—no manual curve copying required.

Step-by-step: Generate a LUT from an image (practical guide)

These steps show a typical, practical flow in Colorby AI. Exact UI labels may vary; use these as an actionable checklist.

Step 1: Prepare your source image

Correct basic exposure and remove extreme clipping where possible.
Set a neutral white balance or shoot in RAW with camera WB preserved.
Remove or mask unwanted color casts, for example strong mixed lighting.

Step 2: Import the image into Colorby AI

Open Colorby AI and load the image you want to use as the source look.
If you want the LUT to be driven by a specific subject, for example skin tones, add a subject mask if available.

Step 3: Run AI Color Match

Use the AI Color Match or equivalent one-tap tool to analyze tone, luminance, and color relationships.
Observe the recommended style; review automatic adjustments to contrast, saturation, and color balance.

Step 4: Fine-tune the result

Adjust strength or amount sliders to control how strongly the LUT should apply.
Make small manual corrections if needed—preserve skin tone and highlight detail.

Step 5: Export the LUT

Open export and choose a LUT format; most workflows support .cube.
Choose grid precision: common options are 17^3, 33^3, and 65^3. For general use, export at 33^3 for a balance of size and smoothness.
Name and save the file for use in other software.

Step 6: Test and iterate

Apply the exported LUT to a different image or video clip.
If you see banding or artifacts, try a higher grid size, for example 65^3, or refine the source adjustments and re-export.

Quick checklist you can copy:

[ ] Source image: neutral WB, healthy exposure, low clipping
[ ] Run AI Color Match
[ ] Adjust strength and preserve critical skin tones
[ ] Export as .cube (33^3 recommended)
[ ] Test on multiple images and refine if needed

Technical notes and best practices

LUT types: 1D LUTs map individual channels separately (useful for contrast curves); 3D LUTs map full RGB combinations (required for complex color shifts and cinematic looks). For look replication, 3D LUTs are standard.
Grid size: Typical options are 17^3, 33^3, 65^3. A 33^3 LUT (35,937 nodes) is a common balance of fidelity vs. file size. Higher grids reduce interpolation artifacts.
Bit depth and precision: LUTs are saved as integer text format, for example .cube, and rely on the host application’s processing precision; higher grid sizes and high-bit source files (RAW, 16-bit TIFF) give smoother outcomes.
Compatibility: .cube is widely supported in Photoshop, Lightroom (via external plugin), DaVinci Resolve, Premiere Pro, Final Cut Pro, and most color grading tools.
Expect limitations: A LUT cannot recreate local corrections such as textures or selective vignettes—it's a global color transform.

Quotable technical statement: A 3D LUT at 33^3 provides a practical balance—smooth color interpolation for most photographic work while keeping file size and computational cost reasonable.

Colorby AI: When to use AI vs manual grading

Use AI LUT generation when you need a consistent look across many images quickly, you don't have a reference preset but want a matched style based on content, or you want to save a repeatable transform as a LUT for future use.
Use manual grading when you need pixel-accurate local adjustments such as dodging, burning, selective masks, or when the look requires complex retouching or texture changes beyond color mapping.

Colorby AI vs Other Approaches (comparison)

One-tap style generation from a single image — Colorby AI: Yes; Manual Grading: No; Generic LUT Marketplace: No.
Requires technical color expertise — Colorby AI: Low; Manual Grading: High; Generic LUT Marketplace: Low.
Repeatable across projects (exportable LUT) — Colorby AI: Yes; Manual Grading: Possible but manual; Generic LUT Marketplace: Yes.
Handles content-aware mood and lighting analysis — Colorby AI: Yes (AI); Manual Grading: Only with manual inspection; Generic LUT Marketplace: No.
Speed (single image to LUT) — Colorby AI: Seconds to minutes; Manual Grading: Minutes to hours; Generic LUT Marketplace: Instant (pre-made).

Practical guidance: Use Colorby AI when you want to create a custom, content-driven LUT; use marketplace LUTs when you need a starting point but expect less contextual specificity.

Real-world examples and use cases

Photographer workflow: After a shoot, generate a LUT from one approved image and apply it across 100+ images to reduce edit time by 60–80%.
Content teams: Create a brand LUT so all creators produce consistent color for social posts and ads.
Video editors: Use the exported LUT as a base grade, then perform clip-by-clip refinement in DaVinci Resolve or Premiere.

Example: If you export a 33^3 .cube LUT from a warm, low-contrast portrait processed in Colorby AI, you can apply that LUT to other portrait shots to quickly match warmth and midtone contrast without repeating manual tone curve work.

Tips to get the best LUT from an image

Start with a well-exposed RAW file: less clipped highlights and preserved shadow detail improve the AI's analysis.
Neutral reference: If possible, include a neutral or gray card in the source image to anchor white balance.
Preserve skin tones: Use a subject mask or manual corrections before export if the subject's skin tones are critical.
Watch for banding: If you see banding after applying the LUT, re-export using a higher grid size such as 65^3 or apply subtle dither or noise.
Document versions: Save LUTs with descriptive names such as BrandWarm_v1_33c.cube and track the source image used for each LUT.

Applying exported LUTs across common tools

Adobe Premiere Pro and After Effects: Import .cube via the Lumetri Color or Apply Color LUT panel.
DaVinci Resolve: Add the LUT in the LUT folder or apply it in the Color page as a node.
Photoshop and Lightroom: Use external LUT plugins or convert the LUT into Camera Raw settings with third-party tools.
Mobile apps: Many mobile color apps accept .cube or custom LUTs via import; check app documentation.

Practical note: Always test a LUT on images with different exposures and skin tones—small differences may require LUT strength adjustment or an added filmic curve.

FAQ

What file formats does Colorby AI export for LUTs?

Colorby AI exports standard LUT files that are broadly compatible with editing software, commonly .cube. Check the export dialog to select format and grid size.

Will a LUT created from one photo work on different cameras and lighting?

Yes—LUTs are global color transforms and will apply across cameras, but results vary. Test and, if needed, adjust LUT strength or export at a higher precision such as 65^3 for demanding matches.

Can a LUT replace local retouching and masking?

No. LUTs apply global color transforms. Use LUTs as a base grade, then perform local retouching for selective corrections such as skin smoothing, spot corrections, and localized exposure changes.

How do I avoid banding when I apply a LUT?

Export a higher-grid LUT (for example 33^3 to 65^3) and work with high-bit source files. If banding persists, add subtle film grain or dither during the final export.

Is Colorby AI suitable for video color grading?

Yes. Colorby AI generates exportable LUTs that can be used as base grades in NLEs and color grading suites. For video, test on representative clips and adjust per-shot as needed.

Practical next steps

Choose a clear, representative photo from the shoot.
Prepare it with white balance and exposure adjustments.
Run Colorby AI's AI Color Match and export a 33^3 .cube LUT.
Test the LUT in your NLE or photo editor on several files.
Iterate with higher grid sizes or tweaks if needed.

Conclusion

Generating a LUT from an image with Colorby AI turns a one-off aesthetic into a repeatable, shareable tool. The workflow reduces repetitive editing, supports consistent visual identity, and shortens turnaround times for photographers, editors, and content teams. Exporting a 3D LUT (33^3 recommended for most use cases) gives you a portable, industry-compatible color transform you can test, tweak, and deploy across projects.