Editor's Note: This guide covers upscaling tools and workflows for enhancing LTX 2.3 video output to 4K resolution.

LTX 2.3 Upscaler Toolkit for ComfyUI

Overview

Upscaling LTX 2.3 output from native resolution (720p-1080p) to 4K requires specialized tools and workflows. This guide covers the most effective approaches.

Upscaling Methods

1. Real-ESRGAN

Installation:

cd ComfyUI/custom_nodes
git clone https://github.com/sberbank-ai/Real-ESRGAN
pip install -r requirements.txt

Models:

• RealESRGAN_x4plus (general purpose)
• RealESRGAN_x4plus_anime (animation)
• RealESRNet_x4plus (sharper, less artifacts)

Settings:

• Tile size: 512
• Tile padding: 32
• Denoise strength: 0.5

2. Topaz Video AI Integration

Workflow:

1. Export from ComfyUI
2. Process in Topaz Video AI
3. Re-import for further processing

Topaz Settings:

• Model: Artemis High Quality
• Enhancement: 100%
• Noise reduction: Medium
• Sharpening: Low

3. Multi-Stage Upscaling

Stage 1: 720p → 1080p (Real-ESRGAN) Stage 2: 1080p → 1440p (img2vid refinement) Stage 3: 1440p → 2160p (Topaz)

Benefits:

• Better detail preservation
• Fewer artifacts
• More control over quality

ComfyUI Workflow

LTX Output → VAE Decode → Real-ESRGAN Upscale
     ↓
Image Sharpen → Video Combine → Export

Quality Comparison

Native 720p: Good for preview Upscaled 1080p: Suitable for web Upscaled 4K: Professional quality

Performance Tips

• Process in batches for long videos
• Use GPU acceleration
• Enable tiled processing
• Monitor VRAM usage

Sources

• LTX Video Model in ComfyUI