How to Export the Contents of a Smart Object in Photoshop CS6
You can export your Smart Object and save it to a hard drive or external media. Photoshop CS6 exports the contents of your Smart Object in its original placed format, such as JPEG, native Illustrator (.ai), TIFF, PDF, and so on. Follow these steps:
Select the Smart Object in the Layers panel.
Choose Layer→Smart Objects→Export Contents.
In the Save dialog box, navigate to your destination and click Save.
If your Smart Object was created from layers, it exports in the PSB format. Remember, you can open the .psb file only in Photoshop. It won’t open in another program.
The last command in the Layer→Smart Objects submenu is Stack Mode. Unfortunately, this command is available only in the Extended version. People in the science, forensics, medical, and pro video fields are probably thrilled over its capabilities. How about the rest of us?
Well, using image stacks can help to decrease the noise in your images across multiple exposures. In this case, noise can be defined not just as the grainy or wavy little artifacts throughout your image, but also anything that you don’t want in the picture — cars, birds, annoying people walking in front of your scenic shot.
If this sounds like something worthwhile for your workflow, it may be worth checking out an upgrade. However, those with the Standard edition can perform a similar task with the Content Aware fill and other cloning techniques.