Adding Sequential Numbers to Images Using Python Pillow

When testing image upload features, it can be cumbersome to remember each image's visual content; labeling images with numbers simplifies verification. This guide shows how to programmatically write numbers onto images using the Pillow library.

Dependencies: Install Pillow via pip install Pillow.

Sample code:

# -*- coding:utf-8 -*-
from PIL import Image, ImageDraw, ImageFont

books = [1]  # image identifiers
img = '本地图片地址.JPG'          # source image path
new_img = 'text.png'            # output image with numbers
compress_img = 'compress.png'  # optional compressed version

# Font configuration
font_type = '/System/Library/Fonts/STHeiti Light.ttc'
font = ImageFont.truetype(font_type, 100)
color = "#000000"

# Open image and prepare drawing context
image = Image.open(img)
draw = ImageDraw.Draw(image)
width, height = image.size

# Positioning parameters
book_x = 5
book_start_y = 190
book_line = 50

for num, book in enumerate(books):
    y = book_start_y - num * book_line
    draw.text((book_x, height - y), u'%s' % (book), color, font)

# Save the modified image
image.save(new_img, 'png')

The script opens the specified image, draws each number from the books list at calculated positions, and saves the result as a new PNG file, enabling easy visual identification during testing.