Easy tool to decompose sprite image? [closed]

Answer 1

Use the slice tool in Photoshop:

1. Use the slice select tool (note the select part of that, see screenshot).
2. Right-click anywhere on the canvas and select Divide Slice... from the drop down menu.
3. Enter in the height/width or sprite multiple.
4. Once finished, go to save for web and devices...
5. When you save, this will export all the individual cutouts to the file format of your choosing in a separate folder.

If they are of uneven size (not on a grid) you can also select them individually with the vanilla 'slice select' tool. If you have a lot of similar grids, save everything as a photoshop action and batch process them.