Color Efex Pro is a complement for Photoshop and other photo editors that corrects and enhances color in any image.
To access Color Efex Pro all you have to do is go to your program's filter menu and select it. Once you open it you will be able to see its complete window of present filters for many different photo types: landscapes, events, trips, architecture...
If any of the Color Efex Pro effects does not agree with you, you have a manual mode to the right where you can define the most appropriate settings for your photo. Shine, saturation, vignette or noise are some of them; they can make the photo look more natural or represent all kinds of emotions.
The integration of Color Efex Pro is total: you can even define the effects first and then apply them to specific areas with other tools such as the brush or the paint cube. Its possibilities are astounding.