Curves Image Effect Node for ComfyUI - Real-time Tonal Adjustments

Introduction

The 'Eses Image Effect Curves' is a ComfyUI custom node that provides a real-time curves adjustment tool directly within the user interface. It allows for interactive control over the tonal range of both images and masks, using a GPU-accelerated PyTorch backend for near instant feedback.

This node is a single tool for tonal adjustments without need to chain multiple nodes together. All curve settings are saved with your workflow and are restored when you reload the page, ensuring a seamless and non-destructive workflow.

https://github.com/quasiblob/ComfyUI-EsesImageEffectCurves

• Interactive Curve Editor:

1. A live preview of the curve is displayed directly on the node, updated in real-time as you drag points.
2. Add and remove editable points for detailed curve shaping.
3. Supports moving all points, including endpoints, on both the X and Y axes for effects like level inversion and crushing blacks/whites.
4. Visual "clamping" lines show when endpoints are moved from the edges, providing clear feedback on the adjustment range.

• Multi-Channel Adjustments:

1. Apply curves to the combined RGB channels for overall tonal control.
2. Isolate adjustments to individual Red, Green, or Blue channels for precise color grading.
3. Apply a separate, dedicated curve directly to an input mask, or to saturation and luma curve.

• State Serialization:

1. All curve adjustments for all channels are saved with your workflow.
2. The node's state, including manually resized dimensions, persists even after refreshing the browser page.

• Quality of Life Features:

1. Automatic resizing of the node to best fit the aspect ratio of the input image.
2. "Reset Curve" button to instantly revert the currently selected channel's curve to a linear state.
3. "Reset Node Size" button to re-trigger the auto-sizing logic.

Recommended machine：Large-PRO

Workflow Overview

How to use this workflow

Step 1: Load Image

Step 2: Adjust Filter Parameters

• The node comes with four filter presets. If you are a PS master, you can adjust the color parameters yourself.
• Curve adjustment is real-time and dynamic, and you don’t need to run ComfyUI once to get feedback.

Step 3: Get Image