This tool can extract png image files from sprite sheet(.pvr.ccz or .pvr or .png and plist).
Make sure you have both the image and plist files in the same directory and open both the two files because of the apple sandbox.
This app is free. Please help the developer to download another app:
https://itunes.apple.com/cn/app/holy-bible-audio-book/id680057614?l=en&mt=12
Thanks.