Customize the thumbnails on a WordPress image gallery page. I would like thumbnails to be a cropped segment of the larger image that you subsequently see when you hyperlink to the full-size imagge. Since the format for my images varies (some photos are vertical, some horizontal, some square) to my eye, the gallery looks messy. By using cropped (150px x 150px) thumbnails, the gallery page would look cleaner and simpler.
I want the ability to use one photo, of my own cropping, for the thumbnail and a second, full size image for the main (detail) view.