Make image grid of posters from IMDB (Python 3, Pillow)

imdb_grid.py

from PIL import Image
import os

# pip install Pillow 

##### Settings #####
grid_size = 9,4 # columns x rows

workdir = '.' # default: "." - current folder
out_file = '_out.png'
image_exts = ('.jpg', '.png', '.bmp')
###############################

# count posters and check lowest common resolution
posters = 0
lowest_common_resolution = 0
for f in os.listdir(workdir):
	if f.lower().endswith(image_exts) and f != out_file:
		posters += 1
		im = Image.open(f)
		w,h = im.size
		if lowest_common_resolution == 0 or w < lowest_common_resolution[0] or h < lowest_common_resolution[1]:
			lowest_common_resolution = w,h


print (posters, "posters")
print ("lowest common resolution:", lowest_common_resolution)

per_row = grid_size[0]
rows = grid_size[1]
poster_resolution = lowest_common_resolution

out_width = poster_resolution[0] * per_row
out_height = poster_resolution[1] * rows
out_image = Image.new("RGB", (out_width, out_height))

x = 0
y = 0
for f in os.listdir(workdir):
	if f.lower().endswith(image_exts) and f != out_file:
		# load image
		#print f
		im = Image.open(os.path.join(workdir, f))
		if im.size != poster_resolution:
			print ("resizing",f,"from",im.size,"to",poster_resolution)
			im = im.resize((poster_resolution))
		coords = (x*poster_resolution[0], y*poster_resolution[1])
		out_image.paste(im, coords)
		x += 1
		if x == per_row:
			x = 0
			y += 1

print ("saving grid with resolution",out_image.size,"to",out_file)
out_image.save(out_file)