TH Image Extension

A simple custom image format (.th) designed to compress and display RGBA images using Python, Brotli compression, and the Pillow library. This project provides the tools to convert standard images to .th format, as well as load and display .th images in a Tkinter GUI. The .th format is compact, efficient, and ideal for applications where file size and display simplicity are priorities.

Features

• Custom Format: Save images in .th format with Brotli compression.
• Compact Storage: Smaller file sizes due to Brotli’s efficient compression.
• Easy Display: Display .th images with Tkinter, making it simple to integrate into Python applications.

How It Works

The .th file structure consists of:

1. Header:
   • Signature (THIMG) to verify file integrity.
   • Image width, height, and color depth.
2. Compressed Data:
   • RGBA pixel data compressed using Brotli.

Installation

Ensure the following libraries are installed:

pip install pillow brotli colorama

Usage

1. Convert an Image to .th Format

To convert an image to .th format:

python main.py convert <input_image> <output_image.th>

2. Display a .th Image

To display a .th image:

python main.py display <file.th>

Example

# Convert example.png to example.th
python main.py convert example.png example.th

# Display example.th
python main.py display example.th

Code Overview

• convert_to_th: Converts a standard image to .th format, compressing RGBA data using Brotli.
• read_th: Reads a .th file, decompresses pixel data, and returns width, height, and pixel data.
• display_th: Uses Tkinter to display the decompressed image.

File Structure of .th

- Signature: 5 bytes (THIMG)
- Width: 4 bytes (unsigned int)
- Height: 4 bytes (unsigned int)
- Color Depth: 1 byte (always 32 for RGBA)
- Compressed Size: 4 bytes (unsigned int)
- Compressed Pixel Data: variable size (Brotli-compressed RGBA data)

Requirements

• Python 3.x
• Pillow 9.x
• Brotli 1.x
• Tkinter (for image display)

License

This project is licensed under the MIT License.