Define a new cropping image size in Wordpress - wordpress

Question

Inside Wordpress, I need to generate and create inside the upload folder a new cropping image size that has:
width=205px
height=120px
Inside my function.php here is my code:
// Call function on after setup
add_action( 'after_setup_theme', 'theme_setup_img' );
function theme_setup_img() {
add_theme_support( 'post-thumbnails' );
add_image_size('search-thumb', 205, 120, true );
// set_post_thumbnail_size( 205, 120, true );
}
However, no new image-sizes have been created inside the upload folder (only default WP sizes). Any solution?
Note: I'm using the default theme and the latest WP version

Answer 1

Your code looks correct. Mine is slightly different and I know it works:
if (function_exists('add_theme_support'))
{
// Add Thumbnail Theme Support
add_theme_support('post-thumbnails');
add_image_size('large', 700, '', true); // Large Thumbnail
add_image_size('medium', 250, '', true); // Medium Thumbnail
}
This was taken from the HTML5 Blank Theme by Todd Motto. Gerald also mentioned writing a script to re-render but there's a great plugin for that called Regenerate Thumbnails that does the same thing.

Answer 2

This might be due to you calling the new size inside the "after_setup_theme" action... I use the following code:
// Add custom image sizes
if( function_exists( 'add_image_size' ) ) {
add_image_size( 'search-thumb', 205, 120, true );
}
And it works every time... if it's inside the functions.php file, you don't need an action or hook to make it work.
Also, you can add this to functions.php to make your custom sizes show up in the drop down menus when inserting images into pages/posts/where ever:
// Functions to add custom image sizes to the media library thickbox area
// and put them into drop down
function my_insert_custom_image_sizes( $sizes ) {
// get the custom image sizes
global $_wp_additional_image_sizes;
// if there are none, just return the built-in sizes
if ( empty( $_wp_additional_image_sizes ) )
return $sizes;
// add all the custom sizes to the built-in sizes
foreach ( $_wp_additional_image_sizes as $id => $data ) {
// take the size ID (e.g., 'my-name'), replace hyphens with spaces,
// and capitalise the first letter of each word
if ( !isset($sizes[$id]) )
$sizes[$id] = ucfirst( str_replace( '-', ' ', $id ) );
}
return $sizes;
}
add_filter( 'image_size_names_choose', 'my_insert_custom_image_sizes' );
You will need a plugin (I use AJAX Thumbnail Rebuild) to resize old images already uploaded before this code was implemented.

Answer 3

The problem here was the "Dynamic Image Resizer" plug-in.
It was breaking my theme with Wordpress 4.0.