Outgoing links on a webpage diluting link juice?

Is it a good idea to no-follow the links on my pages that go to images on my own domain. So the power/authority would be transferred to posts and not wasted on images.

If that is a good idea, how would you do it? Is there code that will tell WP to no-follow any links coming from a certain directory. I think mine looks like this https://domain.com/images

Look for plugins, there are many tat you could use to nofollow specific links.