1. Workflow Overview

This is an auto-coloring workflow for line art based on FLUX-ControlNet-Union-Pro 2.0, optimized for anime-style illustrations. Key features:

• Precise line art control via ControlNet

• Color style enhancement using Lora models (e.g., "白泽MARS-清新二次元")

• Image upscaling (UltimateSDUpscale)

• Dynamic conditional checks (e.g., color threshold detection)

2. Core Models

3. Key Components

Special Nodes:

• AIO_Preprocessor: Line art preprocessing (AnyLineArtPreprocessor_aux)

• ControlNetApplyAdvanced: Advanced ControlNet (strength=0.75)

• CLIPTextEncodeFlux: Prompt encoder with T5XXL support

• Hex to HSL: Color space conversion for conditional logic

Installation:

1. ControlNet: Install ControlNet-AUX via ComfyUI Manager

2. FLUX Nodes: Manual install from GitHub (FLUX-Nodes)

3. UltimateSDUpscale: Search in Manager

4. Workflow Structure

Group 1: Image Condition Checks

• Detects dominant color from line art (GetColorTone)

• Inversion decision via HSL comparison (easy compare)

Group 2: FLUX Generation Zone

• Input: Line art + Positive prompt (detailed girl character description)

• Process:

  1. Load 基础算法_F.1 UNET

  2. Apply two Loras (0.8 + 0.45 weights)

  3. ControlNet constraint

  4. Sampling with KSamplerAdvanced (euler, 30 steps)

Group 3: Upscaling

• 2x super-resolution via 4x-UltraSharp

• Tile processing: 512px, 32px padding

5. Inputs & Outputs

Inputs:

• Line art image (PNG with transparency recommended)

• Positive prompt (pre-configured character details)

• Auto-resolution adaptation

Outputs:

• Colored RGB image (comparison view available)

• HD upscaled version

6. Notes

• VRAM: 12GB+ recommended (peak usage during upscale)

• Model Conflict: Disable other ControlNets to avoid interference

• Color Issues: Adjust GetColorTone detection mode if color shifts occur

• Line Art Specs: Pure black lines + transparent BG, width≥1024px