Is it possible to crop the thumbnail at all depending on the category?

Question

WordPress

As it turned out, the new size of the picture (thumbnail) is registered only once and only here:

function woocommerce_setup() {
  add_image_size( 'own_thumbnail_all', 70, 55 );
}
add_action( 'after_setup_theme', 'woocommerce_setup' );

Otherwise, elsewhere (outside of after_setup_theme) the new thumbnail size won't be applied at all.
Question, am I not able to crop depending on the category ?
Will I have to register 2 different thumbnails?
Type:

add_image_size( 'own_thumbnail_all', 70, 55, true );
add_image_size( 'own_thumbnail', 70, 55, false );

Answer 1

You can generally disable the generation of thumbnails, and sprinkle on the fly in the right place, for example, using this https://github.com/bfintal/bfi_thumb

Answer 2

The thumbnails are created when the image is uploaded to the server, not when the category is created. This is in no way related to each other. Yes, just register a new size.