After you create a final layout of your UVs in the UV Editor, you can export an image of the UV shells using UV Snapshot. UV Snapshot saves a bitmap image of the UV Editor’s 2D view at a user defined resolution. You can use the image and paint a texture to match the UVs.
UV Snapshot works with multiple selected objects and has the ability to extend the region of the snapshot area to encompass the entire range of the selected UV texture coordinates, regardless of whether the UVs belong to a polygonal or subdivision surface type. UV Range options let you specify the region of the UV Editor’s view you want to have captured for the output image.
To save an image using UV Snapshot
Unless specified, the background color for the image will be black.