# ComfyUI-Resolution-Divider

[🇮🇩 **Bahasa Indonesia**](https://github.com/CraftBlack/ComfyUI-Resolution-Divider/blob/main/ID-README.md)

A simple and smart utility node for [ComfyUI](https://github.com/comfyanonymous/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](demo.gif)

## 🚀 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:
   ```bash
   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.