Layout multiple images onto one canvas with Python pillow

image-layout.py

## Pastes Lexis surface diagrams and HAPC plots together

import os
import glob
from subprocess import call
from PIL import Image, ImageDraw, ImageFont

# Get country code list
countries = glob.glob("mort_*.png")
countries = sorted(countries)

## http://stackoverflow.com/questions/3136689/find-and-replace-string-values-in-python-list
## Get the country codes
countries = [countries.replace("mort_", "") for countries in countries]
countries = [countries.replace(".png", "") for countries in countries]

# Set output canvas size
dpi = 300
width  = int((42.0 / 2.54) * dpi)
height = int((29.7 / 2.54) * dpi)

for i in countries:
    # Create blank canvas
    canvas = Image.new("RGBA", (width, height), color = (255, 255, 255))
    
    # Open Lexis surface plot, trim whitespace, paste into canvas
    lexis = Image.open("mort_" + i + ".png")
    canvas.paste(lexis)
    
    # Lexis plots place females on left; males on right
    # Copy this layout for HAPC plots
    
    # Paste in HAPC female plot
    pastex = 0
    pastey = int(height / 2)
    hapc_female = Image.open("cohort_" + i + "_female.png")
    canvas.paste(hapc_female, box = (pastex, pastey))
    
    # Paste in HAPC male plot
    pastex = int(width / 2)
    hapc_male = Image.open("cohort_" + i + "_male.png")
    canvas.paste(hapc_male, box = (pastex, pastey))
    
    # Add annotations
    draw = ImageDraw.Draw(canvas)
    font = ImageFont.truetype("FreeMono.ttf", 100)
    draw.text((20, 20), "Country: " + i, 
    fill = (0, 0, 0, 255), font = font)
    
    # Save
    filename = "country_" + i + ".png"
    canvas.save(filename)

This is great! Where do you provide the data so that I can try out your code?

You just need four images, each about 210x148.5mm (A5) landscape. Although you can of course modify the script to use any number/size images you like