How to Convert JPG to PNG Using Python

Converting image formats is a common task in programming, especially when working with different applications that require specific file types. Python makes this process simple with its powerful libraries. In this guide, we'll use the Pillow module—the most popular Python library for image processing—to convert JPG images to PNG effortlessly.

Why Convert JPG to PNG?

Before diving into the code, let's understand why someone might need this conversion:

Transparency Support: PNG supports transparent backgrounds, unlike JPG.
Lossless Compression: PNG retains image quality better than JPG.
Web Compatibility: Some applications or websites require PNG format.

Prerequisites

To follow along, ensure you have:

Python installed (version 3.6 or higher recommended).
The Pillow library installed (run pip install pillow in your terminal).
A JPG image file for testing.

Step-by-Step Conversion Process

Step 1: Install Pillow

If you haven't installed Pillow yet, run this command:

pip install pillow

Step 2: Write the Conversion Script

Here’s a simple Python script to convert a JPG file to PNG:

from PIL import Image

def convert_jpg_to_png(input_path, output_path):
    try:
        # Open the JPG image
        img = Image.open(input_path)
        
        # Convert and save as PNG
        img.save(output_path, 'PNG')
        print(f"Successfully converted {input_path} to {output_path}")
    except Exception as e:
        print(f"Error: {e}")

# Example usage
convert_jpg_to_png("input.jpg", "output.png")

Step 3: Run the Script

Save the script as jpg_to_png.py and run it using:

python jpg_to_png.py

Ensure input.jpg exists in the same folder, or provide the full file path.

Handling Multiple Files

To convert multiple JPG files in a folder, modify the script:

import os
from PIL import Image

def batch_convert_jpg_to_png(input_folder, output_folder):
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)
    
    for filename in os.listdir(input_folder):
        if filename.lower().endswith('.jpg'):
            input_path = os.path.join(input_folder, filename)
            output_path = os.path.join(output_folder, filename.replace('.jpg', '.png'))
            
            try:
                img = Image.open(input_path)
                img.save(output_path, 'PNG')
                print(f"Converted {filename} to PNG")
            except Exception as e:
                print(f"Failed to convert {filename}: {e}")

# Example usage
batch_convert_jpg_to_png("input_images", "output_images")

Conclusion

Using Python’s Pillow library, converting JPG to PNG is quick and efficient. Whether you're working with single files or batch processing, Python simplifies the task with just a few lines of code.

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