Thumbnail generation cannot be undone. You would have to define the correct image sizes and crop you want and proceed with regenerating the thumbnails again
Related Posts:
- How do you remove hard coded thumbnail image dimensions?
- How do you get the post thumbnail size?
- Setting a post’s featured image from an embedded YouTube video
- Minimum Dimensions Requirement for Featured Image?
- Display thumbnail only if requested size exists
- Post thumbnail alt title
- the_post_thumbnail hard cropping not working no matter what
- the_post_thumbnail with lazyload JQ plugin
- Display Post Thumbnail Without Being Featured Image
- Featured Image of Video from oembed
- Multiple featured image thumbnails for post types (Multiple Post Thumbnails plugin)
- Set post thumbnail as background
- Set post-thumbnail (with php)?
- get_thumbnail_id returns full size image
- can the_excerpt function also get images?
- Change Output for Images in Content
- Add post title as alt tag for featured image
- How to scale up image into thumbnail without distorting it?
- Using Gutenberg block components in admin interface controls
- previous / next post with thumbnail
- Set featured image size for a custom post type
- Multiple Post Thumbnails plugin and attachment error
- WordPress resizes image to the same size as uploaded
- Possible to swap in a placeholder image globally for the_post_thumbnail_url if one doesn’t exist?
- How to set an attachments parent post id in code?
- How to use wp_get_attachment_metadata for thumbnails
- how to set featured image as facebook post thumbnail
- Wrap post thumbnail with
- Use wp_remote_get to add image to media library
- Can a thumbnail of an animated gif be animated?
- Is it possible to get local image URL when also having photon active?
- Featured Image Size Conditional Tag?
- How can I call a thumbnail/featured image to be a background image?
- create new post using rest API and set featured Image from an external link
- Replicate featured image functionality
- Woocommerce – remove the default image placeholder? [closed]
- Remove link from post images
- Call Featured Image from Parent Page
- How to add post featured image url to inline background url()?
- Allow author to choose his featured image size
- How to get cropped thumbnail source for custom post type
- How to not show post_thumbnail from specific category for not logged users
- Using thumbnail functions inside a shortcode
- Featured image for first post only
- Featured Image Not Working when loaded from sub-domain
- How can I use a static (ish) URL for the featured image for a post?
- get_the_post_thumbnail ignores my default thumbnail size [closed]
- specify size of post preview image (not post thumbnail)
- Remove the link to a featured image if and only if it’s not a gif
- How to query posts with featured images
- get_post_thumbnail_id /set_post_thumbnail not working
- hrecipe microformat tag to “featured image”
- Server B handling add_image_size() differently than Server A
- the_title() is not displaying over the_thumbnail
- Show posts image attachments
- Choose to Display Post Thumbnail?
- How do I make images appear in the beside blog post summaries?
- Featured Image meta box shows at the bottom?
- Add extra fields to the post’s featured image
- How to get featured image thumbnail to open larger version in attachment page?
- How To Use YouTube Url Stored In Custom Field To Get Video Image and Set it As Featured Image
- Display post thumbnail in foreach loop
- Add image size array to a portfolio thumbnail in combination with Masonry Jquery Plugin
- Define width of featured image thumbnails, but also make responsive?
- Add title to image post
- How to attach images that I “insert from url” into the post?
- If no featured image, add one of the default images into DB
- the_post_thumbnail(‘medium’) still gives thumbnail-size img
- My Gallery Photos are showing in the post’s excerpts
- How to implement two separate featured images for each post/page
- the_post_thumbnail not resizing
- How to add featured images to posts from a category
- How do you code a featured image into an XML as a jpg link, instead of using a data-id number?
- Change featured image when changing viewport
- Image size doesnt change via wp_get_attachment_image_src
- Adding guiding text to the ‘Featured Image’-box in the backend
- replace featured image from frontend
- Thumbnails regenerate wp_generate_attachment_metadata
- Using the_post_thumbnail do not rollback to original image if specified thumbnail does not exist
- Get author image from corresponding article in thumbnail
- Missing image size
- water mark on featured post image in wordpress
- Making a ‘featured image’ become the image for a full banner (top of page) image in a blog post?
- How to change text of Remove featured image
- Add space under featured image in singel post
- how to use Data URI for images in WP?
- IF statement to filter featured image article
- Featured image url
- How to add a class to figure tag for featured images?
- Post thumbnail won’t resize to fit
- Trouble Retrieving Thumbnail URL on Front-Page
- Featured Image not showing on wordpress hosted under Amazon AWS
- Featured Image / Post Thumbnail Cropping Query
- Using set_post_thumbnail inside save_post action gets overwritten
- trouble with the_post_thumbnail
- How can I make thumbnails a display different size/position if the blog post was posted before a specific date?
- Change background image in PHP
- How to display recent posts on home page with title, post date, author and featured image?
- Display featured image metadata?
- Strange image artifact on font-page thumbnail image