How to Convert JPG to PNG Using Python?

Converting image formats is a common task in programming, especially when working with web applications or data processing. Python, with its powerful libraries, makes this conversion simple. In this guide, we'll use the Pillow module—the most popular Python library for image processing—to convert JPG files to PNG effortlessly.

Why Convert JPG to PNG?

JPG (JPEG) and PNG are two widely used image formats, each with its advantages:

JPG is great for photographs due to its compression, but it loses some quality.
PNG supports transparency and lossless compression, making it ideal for graphics, logos, and web images.

If you need transparency or higher quality, converting JPG to PNG is a smart choice.

Installing the Pillow Library

Before we begin, ensure you have Pillow installed. If not, run this command in your terminal or command prompt:

pip install Pillow

Step-by-Step Conversion Process

Step 1: Import the Required Module

First, import the Image module from Pillow:

from PIL import Image

Step 2: Open the JPG File

Use the Image.open() method to load your JPG file:

image = Image.open("input.jpg")

Step 3: Save as PNG

Now, save the image in PNG format using the save() method:

image.save("output.png", "PNG")

That's it! Your JPG file is now converted to PNG.

Complete Python Script

Here’s the full script for easy reference:

from PIL import Image

# Open the JPG file
image = Image.open("input.jpg")

# Save as PNG
image.save("output.png", "PNG")

print("Conversion successful!")

Handling Multiple Files

If you need to convert multiple JPG files to PNG, use a loop:

import os
from PIL import Image

# Directory containing JPG files
input_dir = "jpg_images/"
output_dir = "png_images/"

# Create output directory if it doesn't exist
os.makedirs(output_dir, exist_ok=True)

# Convert all JPG files in the directory
for filename in os.listdir(input_dir):
    if filename.endswith(".jpg"):
        img = Image.open(os.path.join(input_dir, filename))
        png_filename = filename.replace(".jpg", ".png")
        img.save(os.path.join(output_dir, png_filename), "PNG")

print("All files converted successfully!")

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