ComfyUI-PainterI2VforKJ

此节点是从KJ的wanimagetovideo节点修改而来，感谢KJ🙏

Wan2.2 图生视频增强节点-KJ工作流专用，专门针对4步LoRA（如 lightx2v）的慢动作问题进行优化。

🛠 解决的问题

• ✅ 1.减少慢动作：提升运动幅度 15-50%

• ✅ 2.增强运镜：让运镜提示词更听话，运镜幅度更大

  和wan2.2-KJ节点效果对比

motion_amplitude=1.15	motion_amplitude=1.15	motion_amplitude=1.2
motion_amplitude=1.2	motion_amplitude=1.3	motion_amplitude=1.2

以上视频对比效果，我是使用wan2.2官方模型+light2v 4步i2v lora V1.0做的测试（见下图），其他模型使用效果有待各位自行测试

节点特点

• 单帧输入优化：专为wan2.2单帧图生视频设计
• 即插即用：完全兼容原版 Wan2.2 工作流

📦 安装

方法 1: ComfyUI Manager（推荐）

1. 打开 ComfyUI Manager
2. 搜索 PainterI2VforKJ
3. 点击安装

方法 2: 手动安装

# 进入ComfyUI的custom_nodes目录
cd ComfyUI/custom_nodes

# 克隆仓库
git clone https://github.com/princepainter/ComfyUI-PainterI2VforKJ.git

重启ComfyUI

💡 使用方法

替换节点

在工作流中将 WanImageToVideo 替换为 PainterI2VforKJ

参数设置

• motion_amplitude: 1.15（推荐起始值）
• 其他参数与原版保持一致

场景参数推荐

提示词优化

• 明确描述运动节奏，如 “快速奔跑”、“流畅行走”
• 避免模糊描述如 “移动”、“走动”

🔬 技术细节

核心算法原理

• 亮度保护的运动缩放：放大运动向量前分离亮度均值
• 零 latent 初始化：严格保持 4 步 LoRA 的时序依赖链
• 参考帧增强：使用 reference_latents 保持主体一致性，不约束运动

⚡ 进阶技巧

• 最佳效果：配合强运动提示词使用
• 运动过快：每次减少 motion_amplitude 0.05
• 仍然偏慢：可适当增大到 1.4

🙏 致谢

• Wan2.2 团队：提供惊人的视频生成模型

• ComfyUI 社区：灵活的节点系统
  🙏如果这个项目对你有帮助，请给颗星 ⭐️ 支持一下！

• ComfyUI-Painterl2V

This node is modified from KJ's wanimagetovideo node. Thanks to KJ 🙏

PainterI2V node that specifically fixes the slow-motion issue in 4-step LoRAs (e.g., lightx2v).KJ wan2.2-i2v workflow dedicated

The comparative effects in the above video are from my test using the official Wan2.2 model + Light2v 4-step I2V LoRA V1.0. The performance of other models awaits your own testing .

🛠 Problems Solved

• ✅ Reduces Slow-Motion Drag: Increases motion amplitude by 15-50%
• ✅ Enhance camera movement: Make the camera movement prompts more responsive and increase the movement amplitude.
• ✅ Optimized for Single Frame: Designed specifically for single-frame image-to-video workflows
• ✅ Plug & Play: Fully compatible with original Wan2.2 workflows

📦 Installation

Method 1: ComfyUI Manager (Recommended)

1. Open ComfyUI Manager
2. Search for PainterI2VforKJ
3. Click Install

Method 2: Manual Installation

# Navigate to ComfyUI's custom_nodes directory
cd ComfyUI/custom_nodes

# Clone the repository
git clone https://github.com/princepainter/ComfyUI-PainterI2VforKJ.git

💡 Usage Guide

Replace the Node

In your workflow, replace WanImageToVideo with PainterI2VforKJ.

Parameter Settings

• motion_amplitude: 1.15 (recommended starting value)
• Keep all other parameters consistent with the original node.

Recommended Parameters by Scene

Prompt Optimization Tips

• Clearly describe motion rhythm, e.g., “run fast”, “walk smoothly”
• Avoid vague terms like “move” or “walk around”

🔬 Technical Details

Core Algorithm Principles

• Brightness-Protected Motion Scaling: Separates luminance mean before scaling motion vectors
• Zero Latent Initialization: Strictly preserves the temporal dependency chain required by 4-step LoRAs
• Reference Frame Enhancement: Uses reference_latents to maintain subject consistency without constraining motion

⚡ Advanced Tips

• Best results: Use with strong motion-related prompts
• Motion too fast? Reduce motion_amplitude by 0.05 increments
• Still too slow? Try increasing up to 1.4

🙏 Acknowledgements

• Wan2.2 Team: For the amazing video generation model
• ComfyUI Community: For the flexible node system
• Contributors & testers: For helping refine this node