How to Concatenate Multiple Images Horizontally in Python Using Pillow?

Concatenating Images Horizontally with Python

Combining multiple images horizontally is a common task in image processing. Python offers powerful tools to achieve this using the Pillow library.

Problem Description

Consider three square JPEG images of dimensions 148 x 95. The goal is to horizontally concatenate these images while avoiding any partial images in the resulting output.

Suggested Solution

The following code snippet addresses the problem:

<code class="python">import sys
from PIL import Image

# Get the images
images = [Image.open(x) for x in ['Test1.jpg', 'Test2.jpg', 'Test3.jpg']]

# Determine the total width and height
widths, heights = zip(*(i.size for i in images))
total_width = sum(widths)
max_height = max(heights)

# Create a new, empty image
new_im = Image.new('RGB', (total_width, max_height))

# Paste the images horizontally
x_offset = 0
for im in images:
    new_im.paste(im, (x_offset, 0))
    x_offset += im.size[0]

# Save the output image
new_im.save('test.jpg')</code>

This code iterates over the input images, determining their dimensions. It creates a new image with the total width and the maximum height of all the images. Each input image is pasted horizontally, and their positions are updated accordingly.

Additional Considerations

• The code avoids hard-coding image dimensions by dynamically calculating them.
• By specifying the dimensions in one line, they can be easily adjusted.
• The provided example concatenates three images, but the code can be used for any number of images.

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