Tutorial on batch adding serial numbers to images using the PIL library in Python

Tutorial on batch adding serial numbers to images using the PIL library in Python

This article describes how to add serial numbers to images in batches using the PIL library in Python. The PIL library is a very powerful image processing library in Python. For more information, see

My girlfriend asked me to add a letter serial number to the picture of her paper. I thought it was a very simple thing, but the circle serial number with white background and black characters was hard for me and I tried some common software, none.

After that, I was able to use PS + actions, but it was not easy. I did not finish the work that day, so I took it back to my house, but I didn't have PS on my computer, so it is implemented in python.

　　

The images used here are all 240X240 characters. PIL can be used as the serial number based on the first letter of the file name. Although PIL can be used to calculate the size of the text, characters such as D cannot be in the center of the circle, therefore, offset settings are also made for individual characters. Originally, we wanted to use aggdraw to draw a circle to make it smoother. However, after installing it several times, they all ended up failing and finally gave up.

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#! /Usr/bin/env python #-*-Coding: UTF-8 -*- Import OS, sys, fnmatch Import Image, ImageDraw, ImageFont   Def process_picture (filename ): Seq = OS. path. split (filename) [-1] [0]. upper () Img = Image. open (OS. path. join (input_dir, filename ))   Draw = ImageDraw. Draw (img)   # Draw a black circle in the bottom right corner Draw. ellipse (215,215,235,235), outline = 'black', fill = 'white ')   # Write the letter number into the circle Font = ImageFont. truetype ('fonts/Times New Roman. ttf', 20)   # Calculate the text Center Position Text_size = draw. textsize (seq, font) X = (20/2)-(text_size [0]/2) Y = (20/2)-(text_size [1]/2)   # Letter offset Offsets = {'A': 1, 'B': 1, 'E': 1, 'D': 2} Offset = offsets. get (seq, 0) Draw. text (215 + x + offset, 215 + y), seq, font = font, fill = 'black ')   # Save image Img. save (OS. path. join (output_dir, filename), 'jpeg ')   If _ name _ = '_ main __': If len (sys. argv) <3: Print 'usage: python drawseq. py <input_dir> <output_dir>' Sys. exit (1)   Input_dir, output_dir = sys. argv [1: 3] OS. path. exists (output_dir) or OS. makedirs (output_dir)   For filename in OS. listdir (input_dir ): If fnmatch. fnmatch (filename. lower (), '*. jpg '): Process_picture (filename)

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