It may be that some of your images were uploaded before you created the custom image size function. If that’s the case, a plugin like Force Regenerate Thumbnails will solve your problem. Alternatively, for more versatility you could use the images as backgrounds, like so: <div style=”background-image: url(<?php the_post_thumbnail_url(); ?>)” id=”post-thumbnail”></div> and set the background … Read more
Save image as featured image
I know it’s hard to believe but it’s known and still unresolved issue in WordPress. It’s impossible to output thumbnail size in Gutenberg Gallery Block.
Regenerate thumbnails unexpected resolution (96 x 96)
You can disable the medium and large image sizes by using the ‘intermediate_image_sizes’ filter: function remove_image_sizes($image_sizes){ foreach($image_sizes as $key => $size){ if($size == ‘large’ || $size == ‘medium’) unset($image_sizes[$key]); } return $image_sizes; } add_filter(‘intermediate_image_sizes’, ‘remove_image_sizes’, 12, 1); This skips adding these sizes and the options to insert a medium/large image are left blank in the … Read more
Be sure you have post thumbnails implemented in the theme: http://codex.wordpress.org/Post_Thumbnails Another way to more easily use thumbnails is via WordPress › Get the Image « WordPress Plugins
Having figured out the issue, I’d like to update this question. The issue stems from previous versions of WP not including the _wp_attached_file meta key when uploading media, which 3.4 now seems to require. Below is PHP code for looping through the database, verifying the presence of both the key and image file, then updating … Read more
For this situation, you should use add_image_size. You can find more info about it in the codex. What add_image_size does is register new sizes for your thumbnails, so you can use them with the_post_thumbnail (and other functions). Here´s the example from the codex: if ( function_exists( ‘add_image_size’ ) ) { add_image_size( ‘category-thumb’, 300, 9999 ); … Read more
I had a very similar problem, on a multisite with 8 blogs (2 of them). In my case I discovered that the the meta_value “_wp_attachment_metadata” of some images were corrupted in the table wp_xx_postmeta. It probably happened due to some plugin, because the last thing I did before this issue was to remove several unused … Read more
I solved the problem by using get_the_post_thumbnail() instead of the variables $prevthumbnail and $nextthumbnail. function THEMENAME_post_nav() { // Don’t print empty markup if there’s nowhere to navigate. $previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, ”, true ); $next = get_adjacent_post( false, ”, false ); if ( ! $next && ! … Read more