On this video tutorial Aaron Nace from Phlearn talks about smart objects, smart filters and linked objects in Photoshop.
Nace start with a smart object – smart objects are able to retain the original size of the image. If you don’t convert to a smart object, pixels will be lost when scaling up and down (you can see this in the example Nace shows in the video. To create a smart object, right click on the layer and select “Convert to Smart Object.”
Next we look at smart filter – Once you have a layer that turned into a smart object, you can work with smart filters. This means that any filter or effect you apply to a smart object will automatically become a ‘smart filter.’ You will see it stacked under the layer, and can go into it and edit it. You can also turn the effect on and off, and even change the blending mode easily.
Finally Nace looks at Linked Objects – If a change is made on the original document, it will be applied to all of the linked documents when saved – so cool and something that can be very useful when working on large projects.