I have a WordPress theme which (weirdly enough, it is what it is) requires featured images to be as big or larger than a particular size, which is usually bigger than my featured images.
How can I systematically resize all featured images to be larger (enlarge + crop) than they currently are, to be a specific size, say 700px x 300px?
I've tried ViperBond's regenerate thumbnails plugin by setting the thumbnail size larger, but this didn't work -