merge multi image into one using pillow

merge.py

# -*- coding: utf-8 -*-
from PIL import Image

source = [
  'picture_to_merge.page_0.jpg',
  'picture_to_merge.page_1.jpg',
  'picture_to_merge.page_2.jpg',
  'picture_to_merge.page_3.jpg',
  'picture_to_merge.page_4.jpg',
]

pwd = "/path/to/images"
stack = []
height = 0
width = 0

for i in source:
    path = "{}/{}".format(pwd, i)
    i = Image.open(path)
    w, h = i.size
    stack.append({
        'source': i,
        'width': w,
        'height': h
    })
    #: check for image width
    width = w if w > width else width
    #: since I will merge the image verically, sum the height
    height += h

#: create new canvas
new_img = Image.new('RGB', (width, height))
hpos = 0  #: height coordinate
for i in stack:
    #: place the image to new canvas
    new_img.paste(
        i.get("source"),
        (0, hpos)  #: coordinate w, h
    )
    #: increment the height coordinate
    hpos = hpos + i.get('height')

#: path to new image location
save = "{}/new.jpg".format(pwd)

#: save new image
new_img.save(save)
print("Ok, I'm done")