By Jodi Friedman of MCP Actions: Photoshop Actions and Training
There are literally dozens of ways to saturate your colors in Photoshop. For this post I am going to focus on one way to pop colors using “Channel Mixer” adjustment layers.
To start with, locate an image that could benefit from more vibrant color, overall or in selected spots. Of course, you likely will want to correct exposure and white balance prior to working on color. At this point, we will pull up a “Channel Mixer” adjustment. In CS4, you can use the adjustment panel – in CS3 and below, use the layers palette and go to “Channel Mixers.”
Once you pull up the adjustment layer, you will adjust settings in the dialog box. You will adjust all three output channels: Red, Green, and Blue. Use the same relationship for each. You want all numbers to total 100%. The higher your number for the output channel you are working on, the more saturated the colors will be.