Lighting Effects - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 178

Figure 3.15
5. The orange will work great, but we need to change the violet to a cool blue. Click
the far left marker underneath the gradient bar ( Figure 3.16 ) , and then click the
color swatch to open the Color Picker. Choose a suitable blue, something like R:
107, G: 150, B: 164. But don't worry about getting it exactly right because you can
always modify it later.