How to resize a WP post (product) image?

Question

WordPress

Good afternoon. For the product, I set the image of the product, the file is automatically cropped to 300x300. I need to make the proportions wider. Specifically 510x510. However, there are pictures that are not proportional, for example 9:2. I don't want them to be cut off. How to implement it?

I tried to write in function add_image_size( 'my_cart_image_size', 510, 510, false );
But it didn't work. Or maybe I'm doing something wrong.

Answer 1

If you have WooCommerce, then through the Design Settings -> WooCommerce-> Product Image
And if what is there does not suit you, then dig in the direction of how Opencart does it, because I remember that it simply created a thumbnail of the right size with a white background and contained a photo there without pruning.