What is the size of GameCenter achievement images?

Question

So I want to incorporate GameCenter achievements in my game, but I have to supply images for each achievement for display in the GameCenter app. Apple isn't really clear about the required size. I've read online that they demand 512px images, but then they scale them down to something like 32px which makes it all blurry and/or pixelated.

There must be a better method. I've seen several apps now with crisp, clear achievement images. How do they do this? Thanks.

Answer 1

When you decrease the size of something, more information has to be generated on less pixels.

You would have to create a set of sizes instead of 1 image that you scale.

Edit: I think the size is 955x955, not sure on this though, just read it on a site.

http://www.tuaw.com/2010/04/29/apple-files-official-app-icon-trademarks?icid=sphere_blogsmith_inpage_tuaw

Answer 2

Well it seems we don't have much choice. Apple doesn't accept images smaller than 512px. So we just have to create 512px en hope Apple will resize them well.