Upscaling AI Images in ComfyUI with Promptus

This guide walks you through everything you need to know about upscaling AI images in ComfyUI. ComfyUI is a powerful open-source framework for AI image generation.

Promptus Studio Comfy (PSC) builds upon ComfyUI, offering a browser-based, cloud-powered interface via CosyFlows (no-code), real-time collaboration, and access to advanced models like Gemini Flash, HiDream, and Hunyuan3D. Below, explore various upscaling methods—from basic techniques to advanced models—and learn how to achieve professional results.

🎬 Getting Started With Basic Upscaling in ComfyUI

1. Create Nodes
   • Add an “Upscale Image By” node.
   • Connect it to a “Preview Image” node to compare original vs. upscaled.
2. Set Scaling Factor
   • Typically 2× (doubles image size).
   • Leave the method setting at default initially.
3. Fix the Seed
   • Keep the seed constant to ensure consistency across iterations.
4. Result
   • Basic upscaling increases size but doesn’t dramatically improve quality. Use this step for quick size adjustments before applying advanced upscalers. ⚡

⚙️ Advanced Model-Based Upscaling

1. Load Upscale Model
   • Use a “Load Upscale Model” node for a specialized enhancement model.
2. Connect Upscale Node
   • Add an “Upscale Image (By Model)” node and connect it to your loaded model.
   • Chain this after or alongside your basic upscaling node for both size and quality improvement.
3. Benefits
   • Dramatically better detail, clarity, and texture compared to basic upscaling.
   • Requires downloading trained upscaler models separately.

📥 Where to Find and Download Upscaling Models

• ComfyUI Manager:
  • Navigate to “Install Models” → “Upscale” category.
  • Download directly and restart ComfyUI to access new models.
• CivitAI:
  • Filter by “Upscaler” under Models.
  • View visual comparisons to judge output quality.
• OpenModelDB:
  • Specializes in upscaler models with detailed comparisons.
• Manual Download:
  • Save models into the correct ComfyUI/models/checkpoints (or relevant) folder based on your installation. 🎯

✨ LDSR Upscaler for Enhanced Detail

• Overview: Newer addition excelling at creating detailed, clear images.
• Setup: Download via Manager or “Missing Nodes” if importing workflows.
• Default Settings: Usually work well; increase steps for more detail if needed.
• Considerations:
  • More steps ≠ always better; test per image.
  • Requires significant compute; may not suit all image types.
• Outcome: Impressive detail when applicable, especially for mid-complexity scenes.

🔄 Iterative Upscale Method

1. Nodes:
   • Use “Iterative Upscale Image” node connected to “Pixel KSampler Upscale.”
   • Ensure connection to your model’s VAE and transfer original image settings.
2. Parameters:
   • Steps: ~50 for enhanced detail.
   • Noise Reduction: Set to ~0.1 to maintain fidelity.
   • Iterative Steps: 2–3 passes often work best.
3. Use Cases:
   • Best for landscapes, architecture, or images benefiting from gradual refinement.
   • Not ideal for all images—test to see if it improves your specific content.
4. Result: Can produce excellent detail while preserving the original’s character.

💎 Ultimate SD Upscale – The Premium Option

• Overview: Top-tier upscaling in ComfyUI.
• Setup: Connect “Ultimate SD Upscale” node to necessary upstream nodes; transfer KSampler settings.
• Parameters:
  • Denoise: ~0.1
  • Steps: ~50
• Compute Needs: High GPU requirements and longer processing times.
• Best For: Portraits and human subjects—yields exceptional quality that often justifies resources.
• Result: Superior detail, natural textures, and refined lighting for critical images.

🔍 Comparing Upscaling Methods

• Ultimate SD Upscaler:
  • Excels on portraits and human subjects.
• LDSR & Iterative Upscale:
  • Shine on landscapes, architecture, and scenes where gradual refinement helps.
• Basic Upscaling:
  • Good for simple size increases without quality enhancements.
• Recommendation: Test multiple methods on your images to find the best fit.

🛠️ Optimizing Your Upscaling Workflow

1. Separate Generation & Upscaling
   • First, generate 10–20 images.
   • Select top candidates for upscaling to save time and GPU resources.
2. Modular Pipeline
   • Paste chosen images at the start of your upscaling workflow.
   • Bypass unused nodes to streamline processing.
3. Batch vs. Single
   • Upscale in batches when possible but prioritize quality-checking each result.
4. Resource Management
   • Monitor GPU memory; choose lighter upscalers if VRAM is limited.
   • Consider cloud/GPU sharing (e.g., Promptus) if local hardware is insufficient.

🌐 Getting Started With Promptus

Ready to try upscaling techniques without deep technical setup? Promptus Studio Comfy provides:

• Browser-Based Access: Sign up at https://www.promptus.ai and use Promptus Web.
• Desktop App: Install Promptus App for local integration.
• Pre-Built Workflows: Access ComfyUI upscaling pipelines via CosyFlows (drag-and-drop).
• Distributed GPU Compute: Faster rendering, high-resolution outputs without needing your own high-end GPU.
• Multi-Modal Support: Combine text, image, and video workflows in one platform.
• Collaboration & Publishing: Share workflows, integrate with Discord, and collaborate in real time. ✨

Whether you’re crafting branded visuals, animated stories, or concept art pipelines, PSC makes ComfyUI’s modular upscaling power accessible to studios, agencies, and individual creators.

🎉 Conclusion

Upscaling in ComfyUI ranges from simple size doublings to advanced, model-based enhancements. By understanding and testing:

• Basic Upscaling for quick size changes
• Advanced Models (LDSR, Iterative, Ultimate SD) for detail and clarity
• Efficient Workflows to manage time and resources
  …you can achieve professional-quality results.

Leverage Promptus Studio Comfy for a user-friendly, cloud-accelerated experience, or run ComfyUI locally if you prefer full control. Explore, experiment, and elevate your images with next-level upscaling! 🌟🖼️

Happy upscaling AI Images!