You can use the native WordPress image_resize function to scale up images. WordPress provides a hook called “image_resize_dimensions” which you can use to overwrite the default cropping settings. Here is a modified function which will support scaling up: function image_crop_dimensions($default, $orig_w, $orig_h, $new_w, $new_h, $crop){ if ( !$crop ) return null; // let the wordpress … Read more
I don’t remember a function that will do precisely that, but it is easily achieved with API overall: Retrieve attachment ID with get_post_thumbnail_id() Retrieve available sizes with get_intermediate_image_sizes() For each size use wp_get_attachment_image_src(), which gives precisely data you need (URL and dimensions).
If you want display an image that is inserted into your content (a hotlinked image, for example), you must use a function like this (source): add in functions.php: function catch_that_image() { global $post, $posts; $first_img = ”; ob_start(); ob_end_clean(); $output = preg_match_all(‘/<img.+src=[\'”]([^\'”]+)[\'”].*>/i’, $post->post_content, $matches); $first_img = $matches [1] [0]; if(empty($first_img)){ //Defines a default image $first_img … Read more
This function will generate an image by temporarily registering an image size, generating the image (if necessary) and the removing the size so new images will not be created in that size. function lazy_image_size($image_id, $width, $height, $crop) { // Temporarily create an image size $size_id = ‘lazy_’ . $width . ‘x’ .$height . ‘_’ . … Read more
For me, the button became available once I clicked and dragged the mouse cursor over part of the image to select an area to crop.
I want to disable the srcset only when calling a specific thumbnail size (for example only when calling full image size). Here are two ideas (if I understand you correctly): Approach #1 Let’s check the size from the post_thumbnail_size filter. If it matches a corresponding size (e.g. full) then we make sure the $image_meta is … Read more
Add this to the functions.php file in the theme folder. It replaces the original image with the large image set in settings. You might want to setup a new image format and use that as the new original size though. function replace_uploaded_image($image_data) { // if there is no large image : return if (!isset($image_data[‘sizes’][‘large’])) return … Read more
There is a Plugin called Attachments http://wordpress.org/extend/plugins/attachments/ Maybe this is something you looking for.
This has always been a bugbear for me – the lack of on-demand image sizing, and the subsequent number of files you can end up with if you have lots of sizes! I can see the logic behind your efforts – the trouble is, add_image_size only truly comes into play at point-of-upload. As such, is_page_template(..) … Read more
wp_get_attachment_url() will only return url to original attachment file, this function only accepts attachment id as parameter. Use wp_get_attachment_image_src() or wp_get_attachment_image() instead.