Photoshop Top 40, Feature #16: Adjustment Layers

An adjustment layer is an independent layer of color adjustment that you can edit any time you like. Plus it affects all layers below it, consumes very little space in memory, and affords the opportunity for selective edits.

Photoshop Top 40, Feature #18: Smart Objects

Smart objects aren't all that smart. And they aren't objects. What they are is envelopes. The kind that hold things and keep them safe. The result: nothing you do can cause the image harm. This is Photoshop at its best.

"Photoshop CS4 Smart Objects" Is Complete