How does changing a theme affect my featured images?
I am interested in changing the themes of two of my websites in the very near future. One thing that concerns me is that the featured image sizes would then need to change wouldn't they?
How would I go and then change the featured images for so many blog posts? This could take a huge amount of time.
I am sure there is a way to change my featured image sizes without physically uploading new images but what about when the featured image size is quite small, for example for my one there those images are 250*175. If I make those images larger they will look awful.
I am such a dummy when it comes to graphic design so please explain in a very simple way