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#!/usr/bin/env python3
#
# Copyright (c) 2016 Aaron LI
# MIT license
#
# Created: 2016-05-08
#
"""
Make a montage of the input 4 images by utilizing the `montage`
tool from `ImageMagick`.
Montage:
+----------+----------+
| | |
| image1 | image2 |
| | |
+----------+----------+
| | |
| image3 | image4 |
| | |
+----------+----------+
Note:
The resolution/dimension of the `image1` is taken as the reference, and
the other 3 images are re-sized to match it in order to make an compact
and grid-aligned montage.
Credits:
[1] ImageMagick v6 Examples -- Montage, Arrays of Images
https://www.imagemagick.org/Usage/montage/
[2] ImageMagick montage: Resizing only one input image
https://stackoverflow.com/a/26273173/4856091
"""
import subprocess
import argparse
def get_image_size(image):
"""
Get the size (dimension) of the image by utilizing `identify`.
"""
results = subprocess.run(["identify", "-ping", "-format", "%w %h", image],
check=True, stdout=subprocess.PIPE)
width, height = map(int, results.stdout.decode("utf-8").split())
return (width, height)
def montage_images(infiles, outfile):
"""
Combine the 4 input images to make a montage by utilizing `montage`.
"""
img1, img2, img3, img4 = infiles
# `img1` is taken as the reference image (top-left)
w_ref, h_ref = get_image_size(img1)
w_img2, h_img2 = get_image_size(img2)
w_img3, h_img3 = get_image_size(img3)
# `img2` is re-sized to have the same height as `img1` (top-right)
ratio_img2 = h_ref / h_img2
W_img2, H_img2 = int(w_img2*ratio_img2), int(h_img2*ratio_img2)
# `img3` is re-sized to match the width of `img1` (bottom-left)
ratio_img3 = w_ref / w_img3
W_img3, H_img3 = int(w_img3*ratio_img3), int(h_img3*ratio_img3)
# `img4` is simply re-sized to fill the bottom-right area
W_img4, H_img4 = W_img2, H_img3
subprocess.run(args=[
"montage", img1,
"(", img2, "-resize", "%dx%d" % (W_img2, H_img2), ")",
"(", img3, "-resize", "%dx%d" % (W_img3, H_img3), ")",
"(", img4, "-resize", "%dx%d" % (W_img4, H_img4), ")",
"-geometry", "+1+1", "-tile", "2x2", outfile,
])
def main():
parser = argparse.ArgumentParser(
description="Make a montage of the input 4 images")
parser.add_argument("-o", "--outfile", dest="outfile", required=True,
help="output filename of the montage image")
parser.add_argument("images", nargs=4,
help="filenames of 4 input images")
args = parser.parse_args()
montage_images(infiles=args.images, outfile=args.outfile)
if __name__ == "__main__":
main()
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