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
It sounds like you need to change the URLs for the old images. The easiest & quickest way of doing that is to do a find and replace on the MySQL database. You can use PHPMyAdmin (usually provided by your web host) or other MySQL editing software such as Sequel Pro to make changes to … Read more
The ‘jpeg_quality’ filter hook functions accept two arguments: $jpeg_quality and $function which is the function from within the filter hook is fired and can be either image_resize or wp_crop_image. So there is no way to selectively set the quality of .jpeg images according to image size from this filter hook function. However, you still can … Read more
Concerning documentation there is this blog post on the Make Blog: Responsive Images in WordPress 4.4 To increase the 1600px limit mentioned in the comments try this: add_filter(‘max_srcset_image_width’, function($max_srcset_image_width, $size_array){ return 2000; }, 10, 2); Finally as already mentioned you should fix your calls to add_image_size add_image_size(‘news-large’, 1024, false); needs to be add_image_size(‘news-large’, 1024, 0, … Read more
Step 1: Define two custom image sizes, e.g.: <?php add_image_size( ‘normal-thumbnail’, 400, 300, false ); // Default image size add_image_size( ‘mobile-device-thumbnail’, 200, 150, false ); // Mobile-device image size ?> Step 2: Implement your chosen means to determine client. There are several ways, and which method you use is outside the scope of this question. … Read more
A very special filter The jpeg_quality filter is a really special one: It gets used in three different cases and you’ve to use the second argument to determine, if you want to use the filter or not. Don’t let it do everything The main problem for such a special filter is, that it may fire … Read more
The Approach I think the best approach is to create an image size “on the fly”, just before the images is resized. You can do that using ‘intermediate_image_sizes_advanced’ filter hook. That allows you to edit the size to be generated, but being aware of the current image size, that is stored in the array $metadata … Read more