Extensions/Olm LGG (Lift, Gamma, Gain) for ComfyUI
ComfyUI Extension

Olm LGG (Lift, Gamma, Gain) for ComfyUI

A visual, interactive Lift, Gamma, Gain color correction node for ComfyUI, tailored for precise color grading workflows.

By o-l-l-i·Created about a year ago·Updated 5 months ago· 14
o-l-l-i/ComfyUI-Olm-LGG
Nodes1
On cloudLocal install
Categoryimage/color
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Updated5 months ago

Nodes (1)

Olm Lift Gamma Gain (LGG)
image/color
Readme

Olm LGG (Lift, Gamma, Gain) for ComfyUI

Olm LGG splash

A visual, interactive Lift, Gamma, Gain color correction node for ComfyUI, tailored for precise color grading workflows.

  • Author: Olli Sorjonen
  • GitHub: github.com/o-l-l-i
  • X: @Olmirad
  • Version: 1.0.2 Add responsively scaling real-time image preview (similar to my other nodes.)

✨ What Is This?

Olm LiftGammaGain brings the power of professional-style color grading to ComfyUI with real-time interactivity.

It lets you manipulate shadows (Lift), midtones (Gamma), and highlights (Gain) of an image via intuitive UI elements including color wheels, strength sliders and numeric inputs and a real-time image preview. Designed to be live-adjustable, responsive, and fully integrated into the ComfyUI canvas.

This is a single purpose, one node implementation with minimal dependencies. So if you want this type of color adjustment node without extra bloat, this might be for you.

Use it for:

  • Fine-tuning image tone and contrast
  • Matching lighting and mood across images
  • Creative color grading for generative outputs
  • Prepping images for compositing or other processes

🎨 Features

  • Real-time Feedback: Using a thumbnail preview (requires one graph evaluation).
  • Three-Way Correction: Independent control for Lift (shadows), Gamma (midtones), and Gain (highlights).
  • Color Wheels: Visual editing with interactive RGB color wheels to directly manipulate tonal values by dragging.
  • Strength Sliders: Smooth and precise numeric control over the intensity of each adjustment.
  • Luminosity Sliders: Boost or reduce the luminosity of the selected tonal range.
  • Numeric Inputs: Fine-tune values with default numeric fields if needed.
  • Real-Time Updates: Designed for near real-time feedback with Run (On Change) enabled.
  • Batch Processing: Supports standard ComfyUI batch generations, so you can pass in image batches.
  • State Persistence: Color wheel positions and slider strengths etc. persist across reloads.

📦 Installation

Clone the repository into your custom_nodes folder:

git clone https://github.com/o-l-l-i/ComfyUI-Olm-LGG.git

Your folder structure should look like this:

ComfyUI/
└── custom_nodes/
    └── ComfyUI-Olm-LGG/
        ├── __init__.py
        ├── olm_lgg.py
        └── ... (other files)

Restart ComfyUI to load the node.

No additional dependencies required.

🧪 Basic Usage

  1. Add the Olm LGG node from the node search.
  2. Connect an image output to the input.
  3. Add a Preview Image node and connect it to the Olm LGG node's output.
  4. Run the graph once to generate a preview.
  5. Preview the output instantly in real-time, no need to re-run.
  6. Adjust Lift, Gamma, and Gain using the color wheels.
  7. Fine-tune with the strength and luminosity sliders below each wheel, or use standard numeric fields.
  8. The output will be color graded in real-time, and applied when you run the graph.
  9. Your changes persist across UI reloads.

⚠️ Known Limitations

  • While it may resemble features found in professional grading software, this is not a clone of any specific tool - it's my own interpretation of this type of image adjustment.
  • Preview only appears after graph is run at least once (ComfyUI limitation).
  • Currently only supports RGB color space and a single pass, no layering or other advanced features.
  • No preset system.

💬 Notes

This node is experimental and may change as development continues. It was created for personal workflows and is shared in the hope it benefits others too.

Suggestions and bug reports are welcome — but please understand this is a side project with limited support bandwidth.

Version History

  • 1.0.2 Add responsively scaling real-time image preview (similar to my other nodes.)
  • 1.0.1.1 Chain original mouse event handlers to maintain subgraph header button functionality in ComfyUI frontend 1.24.4 and later.
  • 1.0.0 Initial release

License & Usage Terms

Copyright (c) 2025 Olli Sorjonen

This project is source-available, but not open-source under a standard open-source license, and not freeware. You may use and experiment with it freely, and any results you create with it are yours to use however you like.

However:

Redistribution, resale, rebranding, or claiming authorship of this code or extension is strictly prohibited without explicit written permission.

Use at your own risk. No warranties or guarantees are provided.

The only official repository for this project is: 👉 https://github.com/o-l-l-i/ComfyUI-Olm-LGG

Author

Created by @o-l-l-i