A simple Bash script for converting 360˚ artifact images from the National Museum of Denmark to animated GIFs. Requires ImageMagick.

natmus2gif.sh

#!/bin/bash

# You can use this script to create animated GIFs from the "rotationsbilleder"
# provided by the National Museum of Denmark.
#
# usage: natmus2gif.sh [asset id] [width in pixels]
#
# example: ./natmus2gif.sh 11006 480
#
# This will create a 480px wide animated GIF from the pictures referenced on
# http://samlinger.natmus.dk/DO/11006.

# bail on errors
set -e

# regular expression to match integers
numeric='^[0-9]+$'

# get asset id
id=$1
if ! [[ $id =~ $numeric ]]; then
  echo "error: you must supply a numeric item id" >&2
  exit 1
fi

# get desired width in pixels
width=$2
if ! [[ $width =~ $numeric ]]; then
  echo "error: you must supply a numeric width" >&2
  exit 1
fi

# get the page and extract the frame IDs
echo "fetching html"
images=$(curl -s "http://samlinger.natmus.dk/DO/$id" | \
  /usr/bin/grep -E -o " images:(.*?);" | \
  /usr/bin/grep -E -o "/DO.*?/1000")

# download the individual frames to the current directory
frames=''
while read -r line; do
  collection=$(echo "$line" | cut -d"/" -f2 | tr '[:upper:]' '[:lower:]')
  file=$(echo "$line" | cut -d"/" -f3)
  echo "fetching $file";

  curl -s "http://samlinger.natmus.dk/DO/$file/image/$width" > "./$file.jpg"

  frames="$frames $file.jpg"
done <<< "$images"

echo "creating gif from frames"
convert -delay 60 $frames -layers OptimizeFrame +map -loop 0 -colors 128 \
  "natmus-$collection-$id.gif"

echo "removing source files"
rm $frames