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For some unknown reason all thumbnails are lost in my Shotwell, instead all icons are grey. The images themselves are all okay and I can open them all in Shotwell.

There are only empty folders in .shotwell/thumbs/ so it looks like the thumbnails don't doesn't get generated at all.

I have also tried to re-install Shotwell (by purge it first) without any change.

How do I make Shotwell regenerate all the thumbnails?

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5 Answers 5

up vote 10 down vote accepted

This shell script will regenerate your thumbnails of sizes 128px and 360px so you'll see at least something in viewer.

sqlite3 ~/.local/share/shotwell/data/photo.db \
  "select id||' '||filename from PhotoTable order by timestamp desc" | 
  while read id filename; do
    for size in 128 360; do
      tf=$(printf ~/.cache/shotwell/thumbs/thumbs${size}/thumb%016x.jpg $id);
      test -e "$tf" ||  {
        echo -n "Generating thumb for $filename ($tf)";
        convert "$filename" -auto-orient -thumbnail ${size}x${size} $tf
        echo
      }
    done
  done
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If your pics have exif thumbnails then you may replace convert line with this: tf_src="$(exiv2 -vf -et "$filename" | grep -o "to file .*" | cut -f3- -d" ")" && mv "$tf_src" $tf –  lkp Mar 24 '11 at 17:33
    
The problem with this solution is that any transformations the user has made to the photos -- rotation, crop, color correction -- won't be reflected in the thumbnails. Shotwell stores all thumbnails fully transformed. –  Jim Nelson Aug 1 '11 at 22:14
    
This script assumes you're at the top of your home directory, but otherwise works like a charm. Thanks! –  Reece Nov 14 '11 at 3:57
    
bitbucket.org/reece/reece-base/src/tip/bin/… builds also creates the 360x360 thumbs. –  Reece Nov 14 '11 at 3:58

An easy way for Shotwell to regenerate thumbnails (this is a workaround):

  1. Go to your Photos page.
  2. Edit -> Select All
  3. Ctrl+R (rotate)
  4. When finished rotating, Ctrl+Z (undo).

This will force Shotwell to regenerate all photos and honor any transformations it has stored for them.

As phq mentioned, there is an outstanding bug to fix this so you won't need this workaround. Until then, this is the recommended way to solve this problem. The script posted above will not honor transformations, meaning it's possible for your thumbnails to not look like your photos in Shotwell.

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Just a side note as it's still the same in Shotwell 0.13.1 - horizontal flip seems to be a little faster transformation (tested on 1500 8mpix photos). –  Cyprian Guerra Jan 30 '13 at 22:55

Don't remove .shotwell/thumbs!

According to this bug in launchpad, thumbnails are only generated on import, request for fixing this can be found here.

Thumbnails are only generated at import. If the thumbnails are removed from disk they are not regenerated.

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I just used the shell script given in this answer, but I have about 22000 thumbnails to generate.

So here is a bash version of this script, using ~/.shotwell instead of ~/.local/shotwell (which is what I have) and using as many cores as my processor have (8 times faster in my case!):

#!/bin/bash

# under linux, use this to launch as many convert as your processor core number
#MAX_PROCESSES=`cat /proc/cpuinfo |grep ^processor | wc -l`
# or use a static value
MAX_PROCESSES=4

sqlite3 ~/.shotwell/data/photo.db "select id||' '||filename from PhotoTable order by timestamp desc" | 
  while read id filename; do
      for size in 128 360; do
      tf=$(printf ~/.shotwell/thumbs/thumbs${size}/thumb%016x.jpg $id);
      test -e "$tf" ||  {
              echo "Generating thumb for $filename ($tf)";
              convert "$filename" -auto-orient -thumbnail ${size}x${size} $tf &
          RUNNING="`jobs -p |wc -l`"
          while [ "$RUNNING" -ge "$MAX_PROCESSES" ]
          do
          sleep 0.3
          RUNNING="`jobs -p |wc -l`"
          done
      }
      done
  done
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Shotwell version 0.13.11 on Ubuntu 12.10 Thumbnails seem no longuer to be located in .shotwell/thumbs but now in .cache/shotwell You may check user has full rigths to read thumbs. Having access to pictures but not to thumbs may cause grey thumbs.

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You have not addressed the question about regenerating thumbs. –  phq Apr 16 '13 at 8:43
    
@phq if you would've read the question, you'd see that the question is not necessarily to actually regenerate the thubs, but how to get the thumbs back for which the OP hypothetize the thumbs are missing, and thus propose the regeneration as a fix. In case that the thumbs are actually there, but in a different folder or with the wrong permission, this answer is actually spot on. On top of that, even if you'd only accept answers that foolishly deal only with the subject of the question, please keep in mind that this answer is still useful as a comment (that phq wouldn't have been able to.. –  berdario Sep 12 at 10:05
    
...post as a true comment, due to his low reputations score) –  berdario Sep 12 at 10:05

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