WordPress 2.9 came with a number of nice new features, specifically the ability to assign thumbnails to posts, and to specify the size of those thumbnails by using functions like add_image_size() in your theme’s functions.php file. Unfortunately, add_image_size() isn’t backwards compatible, meaning that any images that were uploaded before the new sizes were created will not have a corresponding thumbnail. Instead, WordPress will grab the size that most closely matches the post thumbnail size, which is not always ideal.
I created a plugin called Thumbnail Updater to address this problem. Thumbnail Updater adds a button to the Edit Media page for each image that says “Update Image Sizes.” Just click the button to update your thumbnails—it can take a while depending on the size of the images and the server speed.
*new* Download: Thumbnail Updater 1.0
Download: Thumbnail Updater 0.1-beta
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THIS IS A TEST YO
Hello,
as the Regenerate Thumbnails plugin miss to do their work on a lot of images, I will have a look at your plugin.
If you could improve your plugin to give the opportunity to resize a selection of images thumbnails it could be beautiful
That actually was my original idea when I first came up with the idea for the plugin. Unfortunately, I found out that I really don’t have any control over which thumbnails are resized. Part of the thumbnail-regeneration process in WordPress involves creating new meta data for the image. When that function — which is a native WordPress function — is called, all image sizes that don’t exist are created.