Pick the size of the featured image?

On my case the theme is using 640×0 size for the featured image.
I want to use another size.
Where can i change it?
I’m ok with hackish solution.

thank you for reading.

• This topic was modified 9 years by CreepyRavioli.

Ok it was easy on your child theme on loop-single.php
change
echo $td_mod_single->get_image('td_640x0');
to
the_post_thumbnail('full');

or whatever the heck you want.

PS i do this because i only have images of 640px and less on my site (they get resized to that on upload).
So no point for me to having the td_640x0 size since they are the exact same size of the full one.

So now i can safely remove those thousands of 640×0 images taking GB of room on my uploads folder.

Cheers!