Python merge PDF images

Yu Shang Palace 2020-11-17 08:30:46
python merge pdf images


1. origin

Recently I need to organize my notes into a pdf Preservation , So we studied how to use Python The code merges all the photos taken into one pdf.

2. The process

To get a requirement, the most important thing is to split large tasks into small modules , Break one by one .

2.1 Taking pictures

The first step is to take all the pages of the book , It should be noted that the page number of the book should be taken , Because the following sort is sorted by file name , The file name of the photo is basically generated according to the time , If it's a mess , Generated at that time pdf The page numbers inside will also be out of order .

2.2 Python Operation Library

Python The best part is that there are lots of third-party libraries that can help us quickly implement the methods we want , We found two libraries ,
PyFPDF  and img2pdf, We choose img2pdf To fulfill our needs
 
pip install img2pdf

 

 
 

2.3 Python Go through the folder to get pictures


 dirname = "f:/wlzcool"
imgs = []
for fname in os.listdir(dirname):
if not fname.endswith(".jpg"):
continue
path = os.path.join(dirname, fname)
if os.path.isdir(path):
continue
imgs.append(path)

 

 
 
Note that if the file name of the image is a pure number and the number of digits is different , The order would be 1 And then 10 instead of 2, You need an extra sort of sorting of numbers , If the file is taken by mobile phone, there is no such problem .

files.sort(key=lambda x: int(x[:-4]))

 

 
 

2.4 Rotate the image display direction and compress pixels

Sometimes the pictures taken by the mobile phone are horizontal , It needs to be changed to vertical
use rotate When you rotate, you need to add expand=True This parameter , Otherwise, there will be black edges .
The photo pixels of the phone are too high , Some need to be compressed to ensure that the final generated pdf The size is moderate .

 img = Image.open(path)
if img.size[0] > img.size[1]:
im_rotate = img.rotate(90, expand=True)
size = (int(im_rotate.size[0] / 3), int(im_rotate.size[1] / 3))
im_rotate = im_rotate.resize(size)
im_rotate.save(savepath, quality=95)
else:
size = (int(img.size[0] / 3), int(img.size[1] / 3))
img = img.resize(size)
img.save(savepath, quality=95)

 

 
 

2.5 The overall code

There are many things to consider when writing a script , For ease of use , The parameters need to be changed to allow user input . For example, the path of the image folder , Compression ratio and so on

from PIL import Image
import os
import img2pdf
flag = False
while not flag:
dirname = input(" Please enter the path of the picture folder ( for example d:/wlzcool):")
flag = os.path.exists(dirname)
if not flag:
print(" Image folder path does not exist !")
saveflag = False
while not saveflag:
savedirname = input(" Please enter the path of the destination image folder ( for example d:/wlzcool2):")
saveflag = os.path.exists(savedirname)
if not saveflag:
print(" Image folder path does not exist !")
automakedir = input(" Whether to create the corresponding folder automatically ?( yes Y/ no N):")
if automakedir.strip().upper() == "Y":
os.makedirs(savedirname)
saveflag = True
files = os.listdir(dirname)
reductionFactor = int(input(" Please input the length width compression ratio ( for example 3):"))
if reductionFactor <= 0:
reductionFactor = 3
isConvertBlack = input(" Whether to output black and white version ?( yes Y/ no N):").strip().upper() == "Y"
for fname in files:
if not fname.endswith(".jpg"):
continue
path = os.path.join(dirname, fname)
savePath = os.path.join(savedirname, fname)
if os.path.isdir(path):
continue
img = Image.open(path)
if img.size[0] > img.size[1]:
im_rotate = img.rotate(90, expand=True)
size = (int(im_rotate.size[0] / reductionFactor), int(im_rotate.size[1] / reductionFactor))
im_rotate = im_rotate.resize(size)
if isConvertBlack:
im_rotate = im_rotate.convert("L")
im_rotate.save(savePath, quality=95)
else:
size = (int(img.size[0] / reductionFactor), int(img.size[1] / reductionFactor))
img = img.resize(size)
if isConvertBlack:
img = img.convert("L")
img.save(savePath, quality=95)
filename = input(" Please input the output file name ( for example : Chapter one ):")
with open(filename + ".pdf", "wb") as f:
imgs = []
files = os.listdir(savedirname)
for fname in files:
if not fname.endswith(".jpg"):
continue
path = os.path.join(savedirname, fname)
if os.path.isdir(path):
continue
imgs.append(path)
f.write(img2pdf.convert(imgs))

 

 

2.6 Package the script into exe

All computers don't have Python Environmental Science , We need to package the script as exe Easy to use on any computer .
Use  PyInstaller To package scripts

2.6.1 install  PyInstaller


pip install pyinstaller

 

 

2.6.2 Packaging script

In the path where the script is located cmd Execute the following command in

pyinstaller -F yourprogram.py

 

 
 
 
Life is too short , I use Python, Powerful third-party libraries can save us a lot of time to develop an interesting Python Picture merge pdf Small application of ,Python It's just cool !

Welcome to my official account. : Temporary camp , Get the latest article

 
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本文为[Yu Shang Palace]所创,转载请带上原文链接,感谢

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