How to join png into one file or one pdf and how to join more pdf files

Posted by pythonprogramming on

I had the will to join more images taken from a Powerpoint file in just one vertical image file. Searching on Stack overflow I found something and I modified so that it works with any file in the directory where you have the png files (instead of 3 of a given name).

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import numpy as np
from PIL import Image
import glob
 
list_im = glob.glob("*.png")
imgs    = [ Image.open(i) for i in list_im ]
# pick the image which is the smallest, and resize the others to match it (can be arbitrary image shape here)
min_shape = sorted( [(np.sum(i.size), i.size ) for i in imgs])[0][1]
imgs_comb = np.hstack( (np.asarray( i.resize(min_shape) ) for i in imgs ) )
 
# save that beautiful picture
imgs_comb = Image.fromarray( imgs_comb)
imgs_comb.save( 'Trifecta.png' )    
 
# for a vertical stacking it is simple: use vstack
imgs_comb = np.vstack( (np.asarray( i.resize(min_shape) ) for i in imgs ) )
imgs_comb = Image.fromarray( imgs_comb)
imgs_comb.save( 'Trifecta_vertical.png' )

Utilities

How to join more png in one pdf file

If you want instead join more png into one pdf, use this script.

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from PIL import Image
from glob import glob
import os
 
iml = []
 
 
files = glob("*.png")
# rgb.save(PDF_FILE, 'PDF', resoultion=100.0)
for f in files:
    print(f)
    print(f[:-4])
    newname = f[:-4] + ".png"
    print(newname)
    os.rename(f, newname)
files = glob("*.png")
print(files)
# rgba = Image.open(PNG_FILE)
# To avoid ValueError: cannot save mode RGBA
rgba = Image.open(glob("*.png")[0])
rgb = Image.new('RGB', rgba.size, (255, 255, 255))  # white background
rgb.paste(rgba, mask=rgba.split()[3])               # paste using alpha channel as mask
for img in files:
    rgba2 = Image.open(img)
    rgb2 = Image.new('RGB', rgba2.size, (255, 255, 255))  # white background
    rgb2.paste(rgba2, mask=rgba2.split()[3])               # paste using alpha channel as mask
    iml.append(rgb2)
pdf = "ALL.pdf"
 
rgb.save(pdf, "PDF" ,resolution=100.0, save_all=True, append_images=iml)

How to make one pdf from more pdf

You need the PyPDF2 module

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import os
from PyPDF2 import PdfFileMerger
 
x = sorted([a for a in os.listdir() if a.endswith(".pdf")])
print(x)
merger = PdfFileMerger()
 
for pdf in x:
    merger.append(open(pdf, 'rb'))
 
with open("result.pdf", "wb") as fout:
    merger.write(fout)
os.startfile("result.PDF")

Find the code here

https://github.com/formazione/pypdf

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