1. Workflow Overview

This workflow achieves high-fidelity face swapping with shape matching through:

1. InstantID Technology: Preserves facial features while replacing targets

2. FLUX Model Enhancement: Improves skin details & resolution

3. Dynamic Mask System: Precise fusion boundary control

4. Color Matching: Ensures natural skin tone transitions

Core Models:

• DreamShaper XL v2.1 Turbo: Base generation

• FLUX Accelerator LoRA: Speed/quality booster

• InstantID ControlNet: Facial feature binding

• RMBG-1.4: Background removal

2. Components Breakdown

Key Nodes:

1. InstantID Trio

   • InstantIDModelLoader: Loads ip-adapter_instant_id_sdxl

   • ApplyInstantID: Performs face feature injection

   • Install: Requires ComfyUI_InstantID plugin

2. Dynamic Mask Chain

   • MaskFastGrow×3: Progressive mask expansion (params: 16/4 → 32/8 → -32/8)

   • MaskComposite: Final synthesis (mode: subtract)

3. Face Shape Matching

   • CropFaces: Extracts face regions (scale factor 1.2)

   • WarpFacesBack: Reintegrates processed faces

4. Dependencies:

   • Must download control_instant_id_sdxl.safetensors

   • Recommended: retinaface_resnet50 face detector

3. Workflow Structure

Group Logic:

• Group 1: InstantID Face Swap

  • Input: Source face + Target portrait

  • Key Nodes: ApplyInstantID + ControlNet

  • Output: Feature-fused latent

• Group 2: FLUX Refinement

  • Uses FLUX.1-Turbo-Alpha LoRA

  • Sampler: Euler+SGM Uniform

  • Output: 2048x2048 HD face

• Group 3: Dynamic Masking

  • 3-stage mask growth → Composite → Edge softening

  • Visualizer: MaskPreview+

• Group 4: Color Matching

  • easy imageColorMatch: ADAIN algorithm

  • Preserves original lighting

4. Inputs & Outputs

Input Parameters:

• Required:

  • Face image (658x877 PNG)

  • Target image (1780x2048 PNG)

• Optional:

  • Prompt: "woman" (customizable)

  • Mask expansion (default: 72px)

Outputs:

• Final Image:

  • Resolution: Original + Super-res

  • Includes: Face comparison slider

• Intermediate:

  • White-background separation (SplitImageWithAlpha)

  • Mask previews

5. Notes

• Hardware:

  • Min: RTX 3060 12GB

  • Recommended: RTX 4090 24GB (for 2048x2048)

• Troubleshooting:

  • Face detection failed:
    → Adjust DetectFaces threshold (default 0.5)
    → Ensure face occupies >15% area

• Optimization:

  1. Reduce KSampler steps (default 10→8)

  2. Use PurgeVRAM to free memory

  3. Disable live preview for batch processing