This is a rather big issue as Photoshop has a wide range of adjustment layers, all with their different implementations and different levels of completeness in the official documentation.

This change would have to be two-fold; adding support for the tagged blocks in the PhotoshopFile under AdditionalLayerInformation and then actually implementing these as an abstraction of Layer<T> in the LayeredFile<T>.

For this issue support would be greatly appreciated as its a rather large issue but at the same time each adjustment layer is its individual separate object. I will attempt to provide a reference implementation once I get started but feel free to contribute!