A simple ruby script (for OS X) for generating all icons outlined in Apple's specificiations: https://developer.apple.com/LIBRARY/IOS/qa/qa1686/_index.html.
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Create icon_seed.png (1024x1024)
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./icon_seed.rb
| Size | Name |
|---|---|
| 1024x1024 | iTunesArtwork@2x |
| 512x512 | iTunesArtwork |
| 152x152 | Icon-76@2x.png |
| 144x144 | Icon-72@2x.png |
| 120x120 | Icon-60@2x.png |
| 114x114 | Icon@2x.png |
| 100x100 | Icon-Small-50@2x.png |
| 80x80 | Icon-Small-40@2x.png |
| 76x76 | Icon-76.png |
| 72x72 | Icon-72.png |
| 58x58 | Icon-Small@2x.png |
| 57x57 | Icon.png |
| 50x50 | Icon-Small-50.png |
| 40x40 | Icon-Small-40.png |
| 29x29 | Icon-Small.png |