Using textures in photo painting and image compositing
You can use textures in photo painting and creating composite images. For information about using textures as clone sources, see To use a texture as a clone source. After you create or modify a texture, you can embed it as a clone source. For information about working with embedded clone sources, see Working with embedded clone sources. Store your content assets as textures in a texture library and reuse them in your projects.
To embed a texture as a clone source
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In the Textures panel (Window 
Media Panels Textures), select a texture, and click the Embed Texture as Clone Source Image button 
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Media Panels Textures), select a texture, and click the Embed Texture as Clone Source Image button .