As you adjust your object's UV coordinates in the Texture Editor, you may find that you want to make changes to the texture image.
To make sure that the image stays properly mapped to the object, you can stamp the UV coordinates onto the texture and save the result as new image. You can then use an external image editor to modify the texture without losing track of how the texture is mapped to your object.
The example above shows a polygon sphere mapped to a plain blue texture. When you stamp the mesh onto the texture, it generates the image on the left.
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