Created
June 2, 2019 03:02
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Turn a panoramic photo into several square photos for Instagram, so that when you scroll they look like one seamless photo
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#!/bin/bash | |
# As of 2017 Feb, Instagram allows multiple photos to be posted side by side. | |
# @idealisms posted some panoramas split up into separate photos. | |
# I wrote this script to generate those square photos from a panorama. | |
if [ -z "$1" ]; then | |
echo "Usage: $0 filename.jpg" | |
exit | |
fi | |
filename="$1" | |
# NOTE: I use 'identify' and 'convert' from ImageMagick | |
# Original image size | |
width=$(identify -format "%w" "$filename") | |
height=$(identify -format "%h" "$filename") | |
# Each of the square pieces will be 1/Nth the width | |
N=$[$width / $height] | |
if [ $N -gt 10 ]; then N=10; fi # maximum 10 allowed by instagram | |
size=$[$width / N] | |
if [ $height -lt $size ]; then size=$height; fi | |
# Use the center of the x,y range | |
x_offset=$[$[$width - $size * N] / 2] | |
y_offset=$[$[$height - $size] / 2] | |
echo "$filename : ${width}x${height}, $N parts" | |
if [ $x_offset -gt 0 ]; then | |
echo "Wide image; truncating $[2 * $x_offset] pixels" | |
else | |
x_offset=0 | |
fi | |
if [ $y_offset -gt 0 ]; then | |
echo "Tall image; truncating $[2 * $y_offset] pixels" | |
else | |
y_offset=0 | |
fi | |
dirname=${filename/.jpg/} | |
mkdir -p "$dirname" | |
for part in $(seq $[$N - 1] -1 0); do | |
crop="${size}x${size}+$[${x_offset} + ${size}*${part}]+${y_offset}" | |
echo " part $part : $crop" | |
convert "$filename" -crop "$crop" "$dirname"/"$part".jpg | |
done |
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