Workflow Overview

This workflow enables background replacement for:

• Objects

• People

• General images

It uses Stable Diffusion (AYU_阿屿_写实大模型_V1), IPAdapter, IC Light, and mask processing to accurately extract subjects and replace backgrounds.

Core Models

1. Stable Diffusion AYU_阿屿_写实大模型_V1

   • Handles image generation and style consistency.

2. IPAdapter (PLUS high strength)

   • Ensures subject integrity while replacing the background.

3. IC Light (iclight_sd15_fcon.safetensors)

   • Matches lighting between the new background and the subject.

4. VAE (Variational AutoEncoder)

   • Encodes and decodes latent images for quality output.

Key Components (Nodes)

1. LoadImage

   • Loads the input image.

2. easy imageRemBg

   • Removes the background and generates a subject mask.

3. GrowMask

   • Expands the mask for smoother transitions.

4. MaskToImage

   • Converts masks into images for background processing.

5. IPAdapterUnifiedLoader & IPAdapterAdvanced

   • Maintains subject consistency.

6. ICLightConditioning & ICLightApplyMaskGrey

   • Matches lighting between subject and background.

7. KSampler

   • Generates a new background based on a text prompt.

8. Image Blending Mode & Image Blend by Mask

   • Combines subject with new background.

9. VAEDecode

   • Converts latent space into a final high-quality image.

10. SaveImage

    • Saves the final background-replaced image.

Workflow Structure

This workflow consists of five main stages:

1. Input & Preprocessing

• LoadImage loads the input.

• easy imageRemBg removes the background.

2. Mask Processing

• GrowMask refines edges.

• MaskToImage converts the mask.

3. Background Generation

• KSampler generates a new background.

4. Merging Subject & Background

• Image Blending Mode & IC Light ensure smooth blending.

5. Output

• VAEDecode produces the final image.

• SaveImage stores the result.

Input & Output

Inputs

• Original image

• Text prompt (for background)

• Mask refinement settings

• Lighting match strength

Outputs

• Background-replaced image

• Ready-to-save output

Considerations

1. Performance

   • Requires RTX 3090+ for best performance.

2. Troubleshooting

   • If subject edges look unnatural, adjust GrowMask strength.

   • If lighting doesn’t match, tweak IC Light parameters.

3. Compatibility

   • Works with ComfyUI 0.4+; some nodes require ComfyUI-Manager.

This analysis provides a detailed guide for beginners and intermediate users to successfully use this background replacement workflow in ComfyUI! 🚀