In Photoshop, the background layer is filled up with a picture. This layer is duplicated and various filters are applied on the duplicate. Now, I would like to change the picture in the background layer and I would like to see the duplicated layer be updated as well, with the new picture. Is this achievable?
The background layer should first be turned into a smart object. Then, the content of the background layer can be changed (and more importantly propagated to the duplicates) by going to
Layer -> Smart Objects -> Replace Contents. This technique might be useful when you have a complicated set of duplicate layers with associated effects and you quickly want to see how they affect pictures other than the one you used to create your set-up.