Selections and Cutouts - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 52

Figure 1.57
Note
In this example choosing Red from the Blend If drop-down menu worked but this
will vary depending on the image you use.
5. At the moment the coffee cutout looks harsh around the edges. To soften this and
help the cutout blend into the scene, Option/Alt-click the black marker in the
gradient bar. Doing so splits it into two so you can move each part independently.
Moving them to 147/198 worked great ( Figures 1.58 and 1.59 ).