How to decompose sprite sheet

Question

I have a lot of spritesheets that are poorly formatted that I want to decompose, or split out into many small images, one for each sprite. If I can do that, I can use my custom texture packer tool to build my game assets with.

My development tools are XNA and C# targetting Windows. How can I decompose the images?

Answer 1

Try Sprite Decomposer or Sprite Vortex, I believe both of them have automatic sprite cutting based on alpha.

Answer 2

Two methods come to mind, depending on the number of fragments that you want to create:

Either Paint, as noted in the comments. Easily faster than coding something up if you have a small-ish number of spritesheets and/or if you are missing most of the mappings.

Or you could write a little XNA program that goes something like this:

• You load all textures that you want to cut up and for which you have mapping coordinates into your GraphicsDevice

• You iterate through the GraphicsDevice.Textures collection of loaded Texture2D objects

• You create Image objects from each Texture2D

• You create sub-images from each large Image, with coordinates according to your mappings. (the code snippet by Ali Hamdar)

• You save the sub-images to wherever you want.

Answer 3

You need to ether go to Adobe fireworks or Paint

But if your doing paint your also going to need paint.net! becuase if you use paint its going to have a background so once you open that sprite in paint.net you can take the background away its really simple but if your worryed about textures like in games you have to make your own.