How do I prevent rails 3.2 from precompiling individual images?

Question

I'm using compass for sprite compilation and I'm wondering how I prevent unused images from getting compiled during rake assets:precompile .

For example in a sass file I have.

@import "my-icons/*.png";
@include all-my-icons-sprites;

After asset precompilation i'm getting the compiled sprite map and all the compiled images:

public/assets/my-icons-{hash}.png
public/assets/my-icons/2-{hash}.png
public/assets/my-icons/3-{hash}.png
public/assets/my-icons/4-{hash}.png
public/assets/my-icons/5-{hash}.png

My question is how do I stop pre-compilation from compiling individual images in my-icons/ and only compiling a single sprite map so that I only end up with public/assets/my-icons-{hash}.png ?

Answer 1

You don't need to. Those images (which are just copies, with a new filename) are not used in your pages so they are not served, they don't consume bandwidth nor memory nor parallel requests.