I'd like to separate a 64px x 512px spritesheet into eight 64px 64px images:
Is this possible? If so, how?
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In Photoshop, use the web slices tool to "slice" up the sprites and then do a Save For Web. Make sure to export all the user slices. This will be much faster then the steps above.
you can unpack the images from a sprite sheet using Spooky software , can unpack the .PNG sprite sheet image. alos you can merge it back
Check out below link : http://store.bluegamerzstudio.com/downloads/spooky-spritesheet-extractor-and-merger/
Video Tutorial https://www.youtube.com/watch?v=oRdrWrktL0M