Never forget your Featured Image Dimensions
Updated August 31, 2012: Thanks to one of the commenters and one of our own developers, the first 2 code snippets have been completely replaced with much-improved, completely different code compared to this post’s original content. As this is one of my favorite bits of functionality, I am very grateful.
All Featured Images Have the Same Dimensions
The following code provides you and your authors with a constant reminder of your ideal Featured Image size so your Featured Images always look their best.
{code type=php}
add_action( ‘do_meta_boxes’, ‘my_do_meta_boxes’ );
function my_do_meta_boxes( $post_type ) {
global $wp_meta_boxes;
if ( ! current_theme_supports( ‘post-thumbnails’, $post_type ) || ! post_type_supports( $post_type, ‘thumbnail’ ) )
return;
foreach ( $wp_meta_boxes[ $post_type ] as $context => $priorities )
foreach ( $priorities as $priority => $meta_boxes )
foreach ( $meta_boxes as $id => $box )
if ( ‘postimagediv’ == $id )
$wp_meta_boxes[ $post_type ][ $context ][ $priority ][ $id ][‘title’] .= ‘ 440w x 300h’;
remove_action( ‘do_meta_boxes’, ‘my_do_meta_boxes’ );
}
Different Featured Image Sizes for each Post Type
If your Posts have a Featured Image size of 440 x 300, your Pages have a Featured Image size of 600 x 200, and your Testimonials custom post type has a Featured Image size of 250 x 250, you need this code instead of the code above.
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{code type=php}
function image_size_html($content =”){
global $post_ID;
$post_type = get_post_type($post_ID);
if ( ! ( post_type_supports( $post_type, ‘thumbnail’ )
&& current_theme_supports( ‘post-thumbnails’, $post_type ) ) )
return $content;
switch($post_type) {
case ‘post’ : $dim = ‘ (440w × 300h)’; break;
case ‘page’ : $dim = ‘ (600w × 200h)’; break;
case ‘testimonials’ : $dim = ‘ (250w × 250h)’; break;
default : $dim =”;
}
$content = str_replace(esc_attr__( ‘Set featured image’ ), esc_attr__( ‘Set featured image’ ) . $dim, $content);
return $content;
}
add_filter( ‘admin_post_thumbnail_html’, ‘image_size_html’, 9999, 1 );
Combine with other Featured Image tools
Because Featured Images are displayed according to the theme’s specifications, these snippets are probably best kept within your theme’s functions.php file instead of in a separate plugin.
I hope you enjoyed these snippets. You might want to use them in combination with these helpful articles:
- Automatically Set the Featured Image
- Auto Scale and Crop image uploads
- Replace Featured Image with a Featured Video