ComfyUI Extension: ComfyUI-UltraPixel

ComfyUI-UltraPixel Introduction

ComfyUI-UltraPixel is an extension designed to integrate the powerful capabilities of UltraPixel into the ComfyUI environment. UltraPixel is a cutting-edge tool for generating ultra-high-resolution images, making it an invaluable asset for AI artists looking to create detailed and high-quality visuals. This extension allows you to leverage UltraPixel's advanced image synthesis features directly within ComfyUI, streamlining your workflow and enhancing your creative output.

Key Features:

• High-Resolution Image Generation: Create stunning images with resolutions up to 4096x4096 pixels.
• ControlNet Integration: Use ControlNet to guide the image generation process with additional control over the output.
• Customizable Workflows: Load and modify provided workflow JSON files to suit your specific needs.

How ComfyUI-UltraPixel Works

ComfyUI-UltraPixel works by wrapping the original UltraPixel code within a ComfyUI node, allowing you to use UltraPixel's capabilities seamlessly within the ComfyUI interface. When you run a workflow, the extension downloads the necessary model files and integrates them into your project. This process ensures that you have access to the latest features and improvements from UltraPixel.

Basic Principles:

1. Node Integration: The extension adds a new node to ComfyUI, which you can use in your workflows.
2. Model Downloading: The first time you run a workflow, the extension downloads the required model files into a designated directory.
3. Image Generation: By connecting the appropriate nodes and inputs, you can generate high-resolution images based on your prompts and settings.

ComfyUI-UltraPixel Features

High-Resolution Image Generation

• Text-to-Image: Generate images from textual descriptions. For example, a prompt like "A close-up portrait of a young woman with flawless skin, vibrant red lipstick, and wavy brown hair, wearing a vintage floral dress and standing in front of a blooming garden" can produce a highly detailed image.
• ControlNet: Enhance your image generation by using ControlNet to provide additional guidance. This feature allows you to load an image and use it to influence the generated output.

Customizable Workflows

• Workflow JSON Files: Load pre-configured workflow files such as workflow_controlnet.json to quickly set up your projects. These files can be modified to better suit your specific needs.
• Directory Customization: Change the default directory for model files by adjusting the ultrapixel_directory or stablecascade_directory settings in the UltraPixel Load node.

GPU Compatibility

• 10GB GPUs: Supports resolutions up to 2048x2048 pixels.
• 12GB GPUs: Supports resolutions up to 3072x3072 pixels.
• 16GB GPUs: Supports resolutions up to 4096x4096 pixels for text-to-image and 3840x4096 pixels for ControlNet.

ComfyUI-UltraPixel Models

ComfyUI-UltraPixel uses different models to achieve its high-resolution image synthesis. These models are downloaded automatically when you first run a workflow.

Available Models:

• Stage B Lite (BF16): A lightweight model optimized for efficiency.
• StableCascade Models: Used for various stages of the image generation process, ensuring high quality and performance.

When to Use Each Model:

• Stage B Lite: Ideal for users with limited GPU memory who still want to achieve high-quality results.
• StableCascade Models: Suitable for more complex and detailed image generation tasks, providing a balance between quality and performance.

What's New with ComfyUI-UltraPixel

Recent Updates:

• Improved GPU Support: As of 7/17, the extension now works with 10GB, 12GB, and 16GB GPUs, allowing for higher resolution outputs.
• Bug Fixes: Resolved an issue with downloading stage_b_lite_bf16.safetensors, ensuring smoother setup and operation.

Why It Matters:

These updates enhance the usability and performance of ComfyUI-UltraPixel, making it more accessible to a wider range of users and improving the overall experience for AI artists.

Troubleshooting ComfyUI-UltraPixel

Common Issues and Solutions:

1. Model Download Failures:

• Solution: Ensure you have a stable internet connection and sufficient disk space. If the problem persists, manually download the models from the provided links and place them in the designated directory.

2. GPU Memory Errors:

• Solution: Adjust the resolution settings to match your GPU's capabilities. For example, use lower resolutions for GPUs with less memory.

3. Workflow Errors:

• Solution: Double-check the connections between nodes in your workflow. Ensure that all required inputs are properly linked.

Frequently Asked Questions:

• Q: How do I change the model directory?
• A: You can change the ultrapixel_directory or stablecascade_directory settings in the UltraPixel Load node to your desired path.
• Q: Can I use ControlNet with this extension?
• A: Yes, you can use ControlNet by connecting the load image node to the controlnet_image input on the UltraPixel Process node.

Learn More about ComfyUI-UltraPixel

Additional Resources:

• UltraPixel Project Page:
• Full Paper:
• Community Forums: Join discussions and get support from other AI artists using ComfyUI-UltraPixel. By exploring these resources, you can deepen your understanding of ComfyUI-UltraPixel and discover new ways to enhance your creative projects.