ComfyUI Extension: ComfyUI-Resolution-Divider

Authored by CraftBlack

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Utility node for ComfyUI that calculates downscaled resolutions while maintaining original aspect ratio, ideal for image-to-video workflows to prevent OOM errors. (Description by CC)

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    README

    ComfyUI-Resolution-Divider

    🇮🇩 Bahasa Indonesia

    A simple and smart utility node for ComfyUI designed to calculate downscaled resolutions while strictly maintaining the original aspect ratio.

    This node is essential for Image-to-Video (I2V) workflows (like Wan 2.2), where using high-resolution input images often leads to OOM (Out of Memory) errors. It helps you find the "sweet spot" (e.g., 480p or 720p) instantly without manual calculations.

    Simple Resolution Divider Node

    🚀 Key Features

    • Smart Parsing: Accepts various format inputs like 1920 x 1080, 1920x1080, 1920 1080, or 1920, 1080.
    • Auto-Detect Resolution: Select an image from your input folder or upload one directly on the node. It automatically reads the dimensions.
    • Real-Time Calculation: The "Live Result" updates instantly via JavaScript as you adjust the slider—no need to queue the prompt to see the numbers.
    • VRAM Saver: Perfect for downscaling 4K/HD images to manageable sizes for heavy models (Wan 2.1, Wan 2.2, etc.) without making the image "squashed" or "stretched".

    Tested Versions

    • ComfyUI version: 0.3.76
    • ComfyUI frontend version: 1.33.10

    📦 Installation

    Method 1: Manual Clone

    1. Navigate to your ComfyUI custom_nodes directory.
    2. Open a terminal/command prompt.
    3. Run the following command: 
      git clone https://github.com/CraftBlack/ComfyUI-Resolution-Divider.git
    4. Restart ComfyUI.

    🛠️ Usage

    1. Add the Node:
      • Right-click canvas -> Resolution Divider.
    2. Input:
      • Option A: Type the resolution manually in res_string (e.g., 1024x1024).
      • Option B: Click "Upload" or select an image from the dropdown. The node will auto-fill the resolution.
    3. Set Divider:
      • Adjust the divider float value.
      • 1.0 = Original Size.
      • 1.5 = 1.5x smaller (Recommended).
      • 2.0 = Half size.

    💡 Why "Divider"?

    Unlike "Scale" nodes which usually multiply (upscale), this node divides (downscales).

    $$ \text{New Size} = \frac{\text{Original Size}}{\text{Divider}} $$

    Example:

    • Input: 1280 x 720
    • Divider: 1.5
    • Result: 853 x 480 (Perfect 480p safe zone for heavy AI models)

    🤝 Contributing

    Feel free to submit issues or pull requests if you have ideas for improvements!

    📄 License

    MIT License. Free to use for everyone.