Photoshop tips - Using the - Blend if feature - Photoshop tips, using layers and blending to replace a sky with a new sky.
The Blend If feature in Photoshop blends one layer into another based on the content of either of the two layers. It can be used, for example, to replace a sky by making it easy for you to knock out the blue sky without having to make a complex selection
The Blend If feature is a handy trick, to replace a background image that maybe you want a slight change in difference in. For instance in this photoshop tip, you will be shown exactly how to master this technique.