ComfyUI Extension: Olm Resolution Picker for ComfyUI

Authored by o-l-l-i

Created

Updated

5 stars

A smart, customizable resolution selector node with live aspect ratio preview, image overlays, and checkerboard support — cleanly parsed from a human-readable text file.

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    README

    Olm Resolution Picker for ComfyUI

    Olm Resolution Picker node image

    The Olm Resolution Picker is a lightweight, customizable resolution selector node for ComfyUI. It allows you to define your preferred image resolutions using a simple resolutions.txt file — making it future-proof, editable, and great for organized workflows.

    This node is built for users who want more than just a few hardcoded presets, or who don't want to have a huge node pack just to get a resolution selector. Whether you're targeting SDXL aspect ratios, cinematic dimensions, or mobile previews, this node makes resolution management intuitive and scalable.

    ✨ Features

    • 📄 User-editable resolutions.txt for full control

    • 🔢 Outputs resolution as width and height integers

    • 🧠 Supports labels (e.g., 768x1344: vertical (9:16))

    • ➕ Allows group headers using -- Header: syntax

    • 🧩 Aspect Ratio Visualization: Optionally toggle a preview image to better understand image composition and framing at a given resolution

    • ♟️ Checkerboard Overlay: Helps visually estimate scale — tile size remains constant regardless of resolution, giving a quick sense of dimensions

    • 🖼️ Replaceable Preview Image: Swap test_image.png in the node’s JS directory to use your own visual reference

    • ✅ Skips invalid lines or malformed input automatically

    • 🛡️ Built-in fallback resolution to prevent broken graph evaluation

    Installation

    1. Clone this repository to your ComfyUI/custom_nodes folder.

    2. Check/install dependencies.

    Most likely you don't need to do this:

    You should already have all of the dependencies installed if you have ComfyUI up and running. Remember to always active the virtual environment (venv) before installing anything.

    pip install -r requirements.txt

    Your folder structure should look like:

    ComfyUI/
└── custom_nodes/
└──── ComfyUI-Olm-Resolution-Picker/
├──── init.py
├──── olm_resolution_picker.py
└──── resolutions.txt

    Restart ComfyUI after installation.

    Usage

    1. Add the Olm Resolution Picker node in your ComfyUI graph.
    2. Pick a resolution from the dropdown, toggle visualizations on/off.
    3. Define resolutions in the resolutions.txt file (see example below).
    4. The selected resolution is returned as width and height (INT, INT).
    5. Safe fallback to 1024x1024 if the selection is invalid or a header is selected.

    How the resolutions.txt Configuration Works

    Have a resolutions.txt file in the same folder as the node. I have provided an example/default file. The format is following:

    // First comment
-- SDXL
1024x1024: square (1:1)
768x1344: vertical (9:16)

// Second comment
-- Cinematic
1536x640: landscape (12:5)
1564x670: cinematic (21:9)
    • Each entry becomes selectable in a dropdown.
    • The node parses only valid WxH resolutions and ignores malformed entries.
    • A resolution entry is defined by [width number][x][height number].
    • Labels after : are shown in the UI but ignored for output.
    • Use -- to add a header.
    • Use // for comments, these are not shown anywhere.

    Customizing the Test Image

    The preview panel includes a small test image to help visualize the selected aspect ratio and cropping.

    If you'd like to use your own image:

    • Locate the test_image.png file inside the js/ folder of this node's directory.
    • Replace it with any image of your choice (a .png file as it's hard-coded).
    • The preview area assumes a 4:3 aspect ratio (e.g., 1024x768), so images that match this ratio will display best without blank areas.

    Parameters

    | Name | Type | Description | |-----------------|---------------|----------------------------------| | resolution | Choice | Resolution string from dropdown | | show_checker | Bool | Optional frontend toggle | | show_image | Bool | Optional frontend toggle | | Output | (INT, INT) | Width and height integers |

    Notes

    This is a personal learning project (v1), created to explore custom node development in ComfyUI. While I took care to ensure it functions properly and it has functioned fine in my own use, there may still be bugs, rough edges, or unexpected behavior - so use with caution.

    Feedback is welcome! Feel free to open an issue if you encounter a problem or have suggestions or ideas to improve the node.

    Author

    Created by @o-l-l-i