ComfyUI Aspect Ratio Selector

A custom node for ComfyUI that generates an empty latent image with the optimal resolution for a given aspect ratio, while preserving the foundational pixel budget (base resolution) of the selected model.

日本語のREADMEはこちら

Features

• Dynamic Resolution Calculation: Maintains the total pixel count appropriate for models like SD 1.5, SDXL, and FLUX, adjusting the width and height to match your desired aspect ratio.
• Model-Specific Alignment: Automatically rounds dimensions to the nearest appropriate multiple for the selected model architecture (e.g., multiple of 64 for SDXL, 16 for FLUX).
• Customizable Models: Easily add or modify supported models and their base resolutions by editing the included config.json.

Included Node

Aspect Ratio Selector

Inputs:

• model: Choose the target model architecture (SD 1.5, SDXL, FLUX.1, etc.).
• aspect_ratio: Choose from standard aspect ratios (1:1, 3:4, 2:3, 5:8, 9:16, 9:21).
• orientation: Portrait (vertical) or Landscape (horizontal).
• batch_size: Number of latent samples to generate.

Outputs:

• width: The calculated width in pixels.
• height: The calculated height in pixels.
• latent: The generated empty latent space.

Installation

Clone this repository into your ComfyUI custom_nodes directory:

cd ComfyUI/custom_nodes
git clone <repository_url> comfyui-aspect-ratio-selector

Restart ComfyUI.

Configuration

You can customize the base models, their target resolutions, multiple alignment constraints, and latent channel counts by modifying the config.json file located in the node directory.

Example config.json entry:

{
  "name": "SDXL",
  "base_width": 1024,
  "base_height": 1024,
  "multiple_of": 64,
  "latent_channels": 4
}

Note: A restart of ComfyUI is required after editing config.json.