As you might know while creating Game Center Leaderboards & Achievements in iTunes Connect, you are required to upload an 512×512 image file to be used as icon to represent those.
But when those are displayed in Game Center, icons are shown in a clipped circle with a border. So, it’s hard to tell which parts will be visible when the image is cropped and it might take few updates to get it right…
When working on our first app, we have decided to make a photoshop template to make things easier by taking out the guess work. Here is the masking template we ended up, ZIP file contains a Photoshop PSD file & a PNG file.
To use it simply place your image below the preview mask, after adjusting it’s position & scale, disable/remove that mask and use the result as your leaderboard / achievement icon image.