Extensions/PNG Info for ComfyUI
ComfyUI Extension

PNG Info for ComfyUI

Reads A1111 and ComfyUI PNG metadata and applies editable generation settings to bound checkpoint, LoRA, CLIP text encode, and KSampler nodes.

By Gerbesh·Created about a month ago·Updated 8 days ago· 2
Gerbesh/png-info-for-comfyui
Nodes—
On cloudLocal install
Stars2
Updated8 days ago
Readme

PNG Info for ComfyUI

A ComfyUI custom node that reads generation settings from PNG files created by Automatic1111 or ComfyUI and reuses them in an editable workflow.

Features

  • Parses the A1111 parameters text chunk and ComfyUI prompt graph.
  • Extracts seed, steps, CFG, sampler, scheduler, denoise, checkpoint, positive and negative prompts.
  • Extracts up to four enabled LoRAs and their strengths.
  • Resolves checkpoint and LoRA names against files installed in ComfyUI.
  • Matches Automatic1111 model/LoRA references across Unicode, spaces, underscores, dashes, hash suffixes, safetensors aliases, LyCORIS tags, and legacy Additional Networks (AddNet) metadata.
  • Provides typed outputs compatible with core KSampler/Checkpoint nodes, Lora Loader Stack (rgthree), and Power Lora Loader (rgthree).
  • Remembers a complete five-node target set, removes the temporary data links, and keeps every destination widget editable.
  • Restores Upload/Apply controls when the PNG Info node is promoted through a ComfyUI subgraph, including workflows saved before frontend 1.47.
  • Resolves saved binding targets recursively across nested subgraphs.
  • Accepts promoted subgraph widgets (for example ckpt_name) as binding targets instead of requiring the loader node to be directly exposed.
  • Includes a compact companion node with only Загрузить картинку and Применить PNG buttons for everyday use of a saved binding.

Installation

From Comfy Registry / Manager:

comfy node install png-info

Or clone the repository manually:

Clone the repository into the custom_nodes folder of your ComfyUI installation:

cd C:\path\to\ComfyUI\custom_nodes
git clone https://github.com/Gerbesh/png-info-for-comfyui.git

Restart ComfyUI, then add PNG Info for ComfyUI from the PNG Info category.

Usage

  1. Add a PNG Info for ComfyUI node and choose or upload a PNG.
  2. Build a normal generation branch containing a core KSampler, CheckpointLoaderSimple, positive/negative CLIPTextEncode nodes, and an rgthree LoRA loader.
  3. For Lora Loader Stack (rgthree), temporarily connect all 17 value outputs: six sampler values, checkpoint, four LoRA/strength pairs, and two prompts. For Power Lora Loader (rgthree), leave the eight LoRA outputs disconnected; the plugin finds the loader connected to the bound KSampler/CLIP branch.
  4. Click Bind all connected nodes & detach. The node stores the five target node IDs in the workflow, removes all temporary links and immediately applies the current PNG metadata.
  5. Edit any populated widget normally. For another PNG, choose the file and click Apply to bound nodes; no reconnection is needed.

When applying to Power Lora Loader, the first four rows are populated and enabled from the PNG metadata. Missing and additional existing rows are disabled so stale LoRAs do not affect the generation. Separate model/CLIP strength mode receives the same parsed strength for both values.

Use Clear binding before wiring a different target set. If a bound target node is deleted, Apply reports its type and ID instead of writing elsewhere. Saved bindings that still point to a removed rgthree LoRA Stack are automatically migrated to the Power Lora Loader connected to the bound generation branch.

For a simplified workflow, keep one configured PNG Info for ComfyUI node in the graph and add PNG Info — Быстрое применение. The compact node uploads and parses the PNG, then applies it through that saved configuration. If the graph contains several configured main nodes, the compact node refuses to guess which one to use.

The node also exposes live outputs:

seed, steps, cfg, sampler_name, scheduler, denoise, ckpt_name, four lora_XX / strength_XX pairs, positive_prompt, negative_prompt, and status.

Matching and fallback behavior

  • A1111 <lora:name:weight> tags are removed from the positive prompt and emitted as separate LoRA values.
  • Asset matching uses exact relative path, filename, then unique filename stem; it never performs fuzzy substitution.
  • A missing checkpoint leaves the target loader unchanged. A missing LoRA is set to None. Both cases are shown in the node status.
  • If more than four enabled LoRAs are found, the first four in model-application order are used and a warning is shown.
  • For PNGs with multiple sampler branches, the parser selects a branch connected to a save/preview output and reports the choice.

Development

python -m pytest
node --check web\png_info.js

The test suite creates tiny synthetic PNG files; source images are not committed.

License

This project is licensed under the MIT License.