IMAGE TO LUT

Steal the grade from any image (BETA)

1. Load Image & Match

Source Image (jpeg or png)

Source Preview

Reference Image (jpeg or png)

Reference Preview

Sensitivity 1.20 Chroma rolloff 0.90

LUT size 33 64 Smoothing 0.30

Exclude black 0.02 Mix 0.15

Banding guard (ordered dithering) Dither strength 0.75

Generate LUT

2. Preview Mode

Source Matched Final

Load Images to Begin

3. Manual Controls & Export

Contrast:-1.00

Saturation:1.00

Temperature (B/A):0.00

Tint (G/M):0.00

Reset Controls

Export Combined .CUBE LUT

This tool is an IMAGE TO LUT generator, a beta application that allows you to "steal the grade" (color and tone adjustments) from a Reference Image and apply it to a Source Image, then export the result as a 3D LUT (Look-Up Table) file.
Please note: This application is currently in BETA, so you may encounter unexpected behavior or bugs.

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Simple User Instructions
The app follows a three-step process: Load & Match, Preview, and Export.

Step 1: Load Image & Match
This is where you upload your images and set the core parameters for the color matching.

1. Load Images:
   • Upload your Source Image (JPEG or PNG) in the first input field. This is the image you want to color-grade.
   • Upload your Reference Image (JPEG or PNG) in the second input field. This is the image whose color grade you want to copy.
   • The "Generate LUT" button will remain disabled until both images are loaded.
     
     
     
2. Adjust Matching Parameters (Optional):
   • Sensitivity: Controls how strongly the color shift from the reference is applied.
   • Chroma rolloff: Helps to prevent oversaturation artifacts (values less than 1 will slightly reduce saturation).
     
     
   • LUT size: Select 33 or 64 for the resolution of the color lookup table. A larger size (64) is more accurate but generates a larger file.
   • Smoothing: Applies a soft blur to the 3D LUT to help prevent artifacts like color banding.
     
     
   • Exclude black: Sets a threshold for how dark a pixel can be before it's ignored during the statistical matching (helps maintain deep blacks).
     
     
   • Mix: Blends the generated LUT with an "identity" LUT (no change). A value of 0.15 (the default) means the final LUT is 15% identity and 85% matched.
     
     
   • Banding guard (ordered dithering): Adds a small amount of noise (dither) to help hide potential color banding in the final image.
     
     
   • Dither strength: Controls the intensity of the banding guard.
     
     
     
3. Generate LUT:
   • Click the Generate LUT button. This will calculate the color-matching transform based on your two images and settings. A status message will appear to indicate the process is running on the CPU. If you make changes to the sliders above, you must click the Generate LUT button to see the effect.

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Step 2: Preview Mode
Once the LUT is generated, you can see how it affects your source image.

• Use the three buttons to switch between preview modes:
  
  
  • Source: Shows the original, un-graded Source Image.
    
    
  • Matched: Shows the Source Image with the auto-generated LUT applied, before any manual adjustments (Step 3).
    
    
  • Final (Active by default): Shows the Source Image with the generated LUT and the manual adjustments (Contrast, Saturation, etc.) applied.
    
    

Step 3: Manual Controls & Export

You can fine-tune the resulting look and save it.

1. Manual Adjustments:
   • Use the sliders to modify the final look after the LUT has been applied.
     
     
     • Contrast
     • Saturation
     • Temperature (B/A) (Blue/Amber)
     • Tint (G/M) (Green/Magenta)
   • The adjustments are performed in the global LAB color space for Temperature, Tint, and Contrast.
     
     
   • Click Reset Controls to return all four sliders to their default values.
     
     
2. Export:
   • Click Export Combined .CUBE LUT. This action generates a single .cube file that includes both the generated color match and any manual adjustments you set in this section. This is the file you can load into other video or photo editing software

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Some stuff I hope you'd enjoy

You can download my favourite LUT for free

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Or you can delete your LUTs and download this instead!