Depending on the number of images, its probably a good idea to manually download them and run a batch script in photoshop to resize them all. Then re-upload them copying over the files in use. This plugin, Regenerate Thumbnails, may also help
Depending on the number of images, its probably a good idea to manually download them and run a batch script in photoshop to resize them all. Then re-upload them copying over the files in use. This plugin, Regenerate Thumbnails, may also help