I'm developing a custom theme that uses several custom image sizes defined in my functions.php like this:

add_image_size('featured_thumb', 175, 120, true);

I then get posts from the database and output on a page like this:

if ($featured)
          global $post;
          foreach($featured as $post)

But this code always outputs a full sized image. I can't figure out why - everything else seems to work alright (the_title(), the_permalink() etc) and it does get the correct image but not in the size I requested.

Does anyone know under what circumstances the_post_thumbnail() will ignore my image size, or what I'm doing wrong?

Edit: using WP 3.4.1

  • Did you regenerate your thumbnails or upload your image after registering your custom sizes?
    – Steve
    Commented Nov 23, 2012 at 13:55
  • yeah I uploaded the images after writing that part of the theme - I think. To be sure I'll regenerate them again now though, that might be it.
    – jammypeach
    Commented Nov 23, 2012 at 13:57
  • Also there is a filter post_thumbnail_size to change the size. Has any plugin or your theme hooked into it? Commented Nov 23, 2012 at 13:57
  • not my theme, but couldn't speak for all plugins. I have none installed that do anything with media, but you never know. regenerating thumbnails at the moment
    – jammypeach
    Commented Nov 23, 2012 at 13:58
  • 1
    Been there and done that.
    – Steve
    Commented Nov 23, 2012 at 14:09

1 Answer 1


Remember that custom image sizes are NOT applied retroactively to images already uploaded.

Use a plugin like Regenerate Thumbnails or similar to generate them.

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