ComfyUI Vectorizer & Background Remover Pack

This repository contains a pack of useful nodes for ComfyUI designed to simplify a professional vector-based image processing pipeline. Convert raster images to clean, scalable vectors using the Vectorizer.AI API, and then remove the background with a background removal node for compositing and further creative work. There are options to scale the vector graphic to a user defined value, this can allow for higher resolution raster graphics without quality loss.

✨ Core Features

High-Quality Vectorization: Integrates with the powerful Vectorizer.AI API to convert PNGs into clean, editable SVGs.
Infinite Scalability: Includes a scaled_png option to render the resulting SVG at any resolution (e.g., 4x, 8x) for crisp, high-resolution raster images without quality loss.
Automatic Background Removal: A smart "green screen" node that automatically detects and removes any solid color background. No AI guessing, just precise, controllable results.
Mask Output for Advanced Workflows: The background remover provides a perfect black and white silhouette mask, ideal for inpainting, compositing, sticker effects, and driving ControlNets.
Secure & Convenient: Supports API key management via an optional config.json file, so you don't have to enter your credentials in the workflow.

📦 Nodes Included

1. Vectorizer.ai API

This node is the bridge to the Vectorizer.AI service. It takes an image and sends it for vectorization.

Inputs: image, API credentials, output_format (svg, png, scaled_png), mode (production or test), and other vectorization parameters.
Output: Returns the original or processed IMAGE back into the workflow.
Functionality: Saves the final vector (.svg) or raster (.png) file to your ComfyUI output directory, respecting your filename_prefix and numbering.

2. Background Remover (Color)

A fully automatic chroma keyer designed for images with a solid color background.

Inputs: image, threshold (to control the edge softness/fuzziness).
Outputs: image_rgba (the subject on a transparent background) and mask (the black and white silhouette).
Functionality: Intelligently detects the background color by analyzing the image borders, making it perfect for automated pipelines where the background color might vary slightly between images.

⚙️ Installation

Activate your venv then proceed by following these instructions:

Clone the Repository

Navigate to your ComfyUI custom_nodes directory and clone this repository:

cd ComfyUI/custom_nodes/
git clone https://github.com/rickrender/ComfyUI-Vectorizer-API.git

Install Python Dependencies

Install the required Python packages using the included requirements.txt file.
```
cd ComfyUI-Vectorizer-API
pip install -r requirements.txt
```
Install System Dependencies (for CairoSVG)

The scaled_png feature relies on the Cairo graphics library. You must install it on your system.
- For Debian/Ubuntu:
```
sudo apt-get update && sudo apt-get install libcairo2-dev pkg-config
```
- For other operating systems, please consult their package manager to install the "Cairo" library.
Set Up API Credentials (Recommended)

Create an account at vectorizer.ai and get your keys from your account page. For convenience, create a file named config.json inside the ComfyUI-Vectorizer-Pack folder. Add your API keys to this file:
```
{
  "api_id": "YOUR_REAL_API_ID",
  "api_secret": "YOUR_REAL_API_SECRET"
}
```
The node will automatically use these credentials if the fields in the UI are left blank. You can also enter them in the UI if you wish instead.
Restart ComfyUI

Completely restart your ComfyUI instance. The new nodes will appear in the "Conversion" category.

Example Usage

Here is a simple, powerful pipeline to go from a generated character to a clean, transparent asset.

Generate Image: Use your preferred method to generate a character on a solid color background.
Vectorize & Scale: Connect the generated image to the Vectorizer.ai API node.
- Set output_format to scaled_png.
- Set scale to your desired multiplier (e.g., 4.0).
Remove Background: Connect the IMAGE output from the Vectorizer node to the Background Remover (Color) node.
- Adjust the threshold slider (a value around 0.3 to 0.4 is often a good start) to get a clean edge with minimal color halo.
Save Final Image: Connect the image_rgba output from the remover node to a Save Image node. Ensure you use a format that supports transparency, like PNG.
(Optional) Use the Mask: Connect the mask output to other nodes to perform inpainting, create outlines, or for advanced compositing.

Dependencies

Python: requests, CairoSVG
System: libcairo2 or equivalent

License

This project is licensed under the MIT License.

Acknowledgements

This node pack utilizes the powerful Vectorizer.AI service.

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