Title: add_image_size doesn't work?
Last modified: August 20, 2016

---

# add_image_size doesn't work?

 *  [elladesign](https://wordpress.org/support/users/elladesign/)
 * (@elladesign)
 * [14 years, 9 months ago](https://wordpress.org/support/topic/add_image_size-doesnt-work/)
 * Hi, I am a newbie in this.. please help.
 * I am trying to add an additional image size for a post. I am using a child theme
   of twentyten theme.
 * In my child theme function.php, I have added these lines
 *     ```
       if ( function_exists( 'add_theme_support' ) ) {
       	add_theme_support( 'post-thumbnails' );
       	set_post_thumbnail_size( 600, 150, true );
       	add_image_size( 'category-thumb', 300, 500 );
       }
       ```
   
 * But the new image size “category-thumb” is not showing up as an option when I
   am setting feature image.
 * Can someone please help?? thanks!!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Moderator [keesiemeijer](https://wordpress.org/support/users/keesiemeijer/)
 * (@keesiemeijer)
 * [14 years, 9 months ago](https://wordpress.org/support/topic/add_image_size-doesnt-work/#post-2316706)
 * By default the post thumbnail will have the 600 x 150 pixel size as set in your
   functions.php. When adding new image sizes you will have to make changes to your(
   child) theme’s template files to use them. In stead of `the_post_thumbnail();`
   you can now change it to `the_post_thumbnail( 'category-thumb' );` to show the
   new size post thumbnail in the template files you want. These added (post thumbnail)
   sizes will not show by default when adding a new image.
 *  Thread Starter [elladesign](https://wordpress.org/support/users/elladesign/)
 * (@elladesign)
 * [14 years, 9 months ago](https://wordpress.org/support/topic/add_image_size-doesnt-work/#post-2316773)
 * Thank you for your reply. It works now.. Just for reasons I thought using “add_image_size”
   means that it’ll display another image size e.g. “category-thumb” in the UI.
 * Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘add_image_size doesn't work?’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [elladesign](https://wordpress.org/support/users/elladesign/)
 * Last activity: [14 years, 9 months ago](https://wordpress.org/support/topic/add_image_size-doesnt-work/#post-2316773)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics