Resizing old post thumbnail images

I’ve figured this out. Appears as though I really wanted add_image_size('post', 475, 475, true); and then reran the Regenerate Thumbnails plugin. After sorting out a permissions error on /wp-content/uploads, this worked great.

Then in my theme, I just displayed this image size for the post thumbnail. the_post_thumbnail('post');

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)