# PNG Metadata Editor

A graphical tool for viewing and editing metadata in PNG files.

![PNG Metadata Editor Screenshot](screenshot.png)

## Features

- View all metadata fields (tEXt, zTXt, iTXt chunks) in PNG files
- Add, edit, and delete metadata fields
- Pretty-print JSON-formatted values
- Copy metadata values to clipboard
- Visual indication of unsaved changes

## Installation

### Prerequisites

- Python 3.6+
- Tkinter (usually included with Python)

### Dependencies

Install required packages using pip:

```bash
pip install pillow pngmeta
```

## Usage

1. Run the application:
   ```bash
   python png-meta-editor.py
   ```

2. Open a PNG file using the "Open PNG File" button

3. View metadata in the tree view on the left
4. Select a field to see its full value in the detail pane
5. Use the buttons to add, edit, or delete fields

## Building for Distribution

To create a standalone executable:

```bash
pyinstaller --name="PNG Metadata Editor" \
            --windowed \
            --onefile \
            --icon=AppIcon.icns \
            png-meta-editor.py
```

The resulting executable will be in the `dist/` directory.

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

## Author

Robert Tusa
[Your Contact Information]

## Version History

- 2023-10-01: Initial release