When reinstalling, upgrading or moving settings, thumbnails may be missing in Shotwell. The problem can look like this:
Each time you import photos, Shotwell will generate thumbnails in two different sizes. If you loose them, you have the problem that they are regenerated on-demand, everytime you scroll by an image. That stinks.
Requirements
You need to do apt-get install sqlite3 imagemagick to fetch requirements.
Source
Here's a script that will regenerate everything, and it's tested on Shotwell 0.18.0. View / fork Gist souce.
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20 | #!/bin/bash
# Based on http://gagor.pl/2014/01/regenerate-thumbnails-in-shotwell-for-last-month/
THUMB_ROOT=~/.cache/shotwell/thumbs
# Remove " > date('now','start of month','-1 month')" if you want to re-generate everything
sqlite3 ~/.local/share/shotwell/data/photo.db \
"select id||' '||filename from PhotoTable where date(timestamp,'unixepoch','localtime') > date('now','start of month','-1 month') order by timestamp desc" |
while read id filename; do
tf1=$(printf $THUMB_ROOT/thumbs128/thumb%016x.jpg $id);
tf2=$(printf $THUMB_ROOT/thumbs360/thumb%016x.jpg $id);
if [ -e "$tf1" ]
then
echo "Skipping $filename"
else
echo -n "Generating thumb for $filename";
#echo $tf1
convert "$filename" -quality 60 -auto-orient -thumbnail 128x128 $tf1
convert "$filename" -quality 60 -auto-orient -thumbnail 360x360 $tf2
echo
fi
done
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