Smart Objects and Smart Filters
Adobe introduced Smart Object functionality with Photoshop CS3. Smart Objects are regular pixel layers or other pixel-based objects (such as RAW image files or Illustrator graphic files) that Photoshop embeds separately in another object. The embedded object and its layer remain unchanged (i.e., is edited non-destructively), even if filters or other corrections are applied to the rest of the image. In order to do this, Photoshop creates a locked, temporary layer on which the selected operations are performed.
If you import a Smart Object into Photoshop, it appears like a regular layer that can be manipulated using adjustment layers and other tools. However, double-clicking a Smart Object opens Adobe ...