Prompts Image Image gen

Improved H3 RefMods Guide

Prompt Edit here before copy/try — source content is unchanged

### Features
- Improved RefMods for better accuracy and reduced identity bleed
- Added video editing masking functionality
- Optimized image encoding for faster processing

### Key Improvements
1. **Storage Optimization**
   - Stores reference images as JPEG data alongside latent data in .safetensors files
   - Text encoder can read JPEG data directly without VAE decoding
   - Caching mechanism: as long as refmod order/strength doesn't change, processing is skipped

2. **stack_pictures Function**
   - "every 4th": Sends every 4th frame in chunks of 2 (default, suitable for single refmod)
   - "up to 8": Samples up to 8 frames across dataset and feeds individually (more detail but longer processing)
   - "all": Sends all frames (maximum detail but most time-consuming)

3. **Video Editing Masking**
   - Added SAM 3.1-based automatic masking in Media Loader
   - Supports manual addition of moving keyframed shapes (rectangle/ellipse) for editing
   - Uses Fantastic H3 Edit Composite node to composite masked generation over original clip

### Usage
1. Load existing RefMods or create new ones using provided nodes
2. Set subject_definitions and retention_analysis in Prompt Builder
3. Choose appropriate stack_pictures option ("every 4th", "up to 8", "all")
4. For video editing, use Media Loader's masking feature for region selection
5. Use Fantastic H3 Edit Composite node for final composition

### Notes
- H3 model does not support negative prompts, avoid using "no" or "not"
- When defining subjects, use unique descriptive words to differentiate characters
- For video processing, consider using audio optimization tools for better results

Uses the text above; some sites may auto-send

Usage & requirements

Load RefMods in ComfyUI, set subject definitions and retention analysis, choose stack_pictures option and use media loader for video masking editing.

Tools: ComfyUI Stable Diffusion
Variables: refmods subject_definitions retention_analysis stack_pictures_option video_mask
Source: r/StableDiffusion ↗

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