[development] Fielfield alt and title update via VBO

Hi, I have a site with a few hundred nodes each with about 5-10 images, i've updated the image fields to have alt and title tags based on tokens. I'm looking for a way to generate these new title and alt attributes to all images and nodes via vbo. I tried the "save node" action, and even updating a field, but these actions don't create new titles and alt attributes on the images. Editing and saving them one by one does update the fields, but I don't really want to go that route. this is drupal 6... any help would be appreciated. Idan www.pixelwrapped.com