1. Workflow Overview

This workflow specializes in background replacement and light adjustment, with key features:

1. Remove original background (e.g., portrait segmentation).

2. Replace with custom background (e.g., snowy scene).

3. Add controllable light sources (e.g., top white light) for scene blending.

4. Optimize lighting consistency via ICLight model.

Use Cases: Portrait retouching, e-commerce product editing, virtual scene compositing.

2. Core Models

3. Key Nodes

4. Workflow Groups

1. Input Group

   • Input: Source image (e.g., image.png, 976x1424).

   • Key Nodes: LoadImage → easy imageRemBg for mask generation.

2. Preprocessing Group

   • Background Handling:

     • Scale background via BackgroundScaler.

   • Light Addition:

     • Configure LightSource (e.g., Top Light, color #FFFFFF).

3. Light Optimization Group

   • ICLight Processing:

     • Load model via LoadAndApplyICLightUnet.

     • Inject light data into latent space with ICLightConditioning.

4. Generation & Output Group

   • Sampling & Decoding:

     • KSampler with dpmpp_2m_sde (25 steps, CFG=0.9).

     • VAEDecode for final image.

   • Detail Fusion:

     • Blend foreground/background via DetailTransfer (soft_light mode).

5. Inputs & Outputs

• Required Inputs:

  • Foreground image: Clear subject (e.g., portrait), simple background preferred.

  • Prompts:

    • Positive: Target background (e.g., In the snow).

    • Negative: Exclude artifacts (e.g., nsfw).

  • Light parameters: Position, color, intensity (e.g., top light, intensity=2).

• Output:

  • Composited image with lighting, preview via PreviewImage.

6. Notes

1. Hardware:

   • ≥8GB VRAM (RTX 3060+ recommended) due to ICLight and RealisticVision models.

2. Troubleshooting:

   • Incomplete masking: Adjust easy imageRemBg threshold or manually edit mask.

   • Unnatural lighting: Tweak ICLightConditioning weight (default=0.18215).

3. Extensibility:

   • Replace RealisticVision with other models (e.g., JuggernautXL) for style variation.