Gee, I keep solving my own problems all the time. Here’s how I solved it in the end. I discovered that add_image_size does not ignore the identical dimensions of the image size, but instead points the file name towards the same file in the uploads dir. Once I knew that, I could just save the … Read more
You can use the wp_generate_attachment_metadata filter: function wpse_183835_to_jpeg( $meta, $post_id ) { $sizes_to_convert = array( ‘thumbnail’, ); $path = dirname( get_attached_file( $post_id ) ); foreach ( $sizes_to_convert as $size ) { if ( ! empty( $meta[‘sizes’][ $size ] ) ) { $data = $meta[‘sizes’][ $size ]; if ( $data[‘mime-type’] === ‘image/png’ && is_file( $file = … Read more
If you only want to add an extra class, then you should use wp_get_attachment_image. It has few extra params, and the last one is used for setting class names. Sample usage: <?php echo wp_get_attachment_image( get_the_ID(), ‘thumbnail’, “”, [“class” => “my-custom-class”] ); ?> The main advantage of this aproach is that you will also get the … Read more
The easiest and simplest way to do it is define a unique variable in your theme’s functions.php file. Such as: <?php $theme_name_images = get_bloginfo(‘stylesheet_directory’) . ‘/images/’; ?> No need for classes as a previous answer suggested. EDIT: It should be get_bloginfo, instead of bloginfo(), as Viper007Bond kindly pointed out.
The featured image attachment id is stored in the post_meta table, with the meta_key _thumbnail_id. Use that post id to find the post meta with meta_key _wp_attachment_metadata. The value of that is a serialized array with keys thumb, file, width, height, sizes (an array), and image_meta (an array). The file value is relative to the … Read more
Unfortunately there is no legal way to control it. But there is a dirty way to do it… If you select this route, then you will need to : clone the standard gallery_shortcode function add a default value for $attr[‘link’] option hook your cloned function into post_gallery filter The final result will look like this: … Read more
You can customize or change WordPress image sizes using this function: http://codex.wordpress.org/Function_Reference/add_image_size <?php add_image_size( $name, $width, $height, $crop ); ?> The $crop parameter can be set to false for proportional or true for hard crop (it will hard crop from the center). If you use this function on already existing images you will need to … Read more
You can try the following to clear the image attachment’s title when it’s inserted but not updated: /** * Empty the image attachment’s title only when inserted not updated */ add_filter( ‘wp_insert_attachment_data’, function( $data, $postarr ) { if( empty( $postarr[‘ID’] ) && isset( $postarr[‘post_mime_type’] ) && wp_match_mime_types( ‘image’, $postarr[‘post_mime_type’] ) ) $data[‘post_title’] = ”; return … Read more
There’s not enough info to be sure this answer is definitive but here’s an attempt. Firstly make sure the image you are uploading is actually larger than the size you have defined. I see people upload images that are too small and then get this sort of result all the time. Secondly, WP will only … Read more
Here’s how I recently added a custom taxonomy to the media library as a sortable column: // Add a new column add_filter(‘manage_media_columns’, ‘add_topic_column’); function add_topic_column($posts_columns) { $posts_columns[‘att_topic’] = _x(‘Topic’, ‘column name’); return $posts_columns; } // Register the column as sortable function topic_column_register_sortable( $columns ) { $columns[‘att_topic’] = ‘att_topic’; return $columns; } add_filter( ‘manage_upload_sortable_columns’, ‘topic_column_register_sortable’ ); … Read more