Photoshop - Selective color editing

There is a simple way to make something in a photograph really pop using Photoshop. Let's take a look at one way to do selective color editing in a photo.

In this example of the car, lets take a look at just editing the red in the car. The first thing you'll want to do is make a rough selection around the car.
Then, go to Image > Adjustments > Selective Color.
Since the car is red lets make sure you have "Reds" selected in the drop-down menu for Colors.

Since Cyan is the opposite of Red, notice the changes in color of the selected red car when I adjust the Cyan slider. Because there is very little red color data around the car it's easy for me to make a rough selection of the car and do this editing without damaging the the ground around the car.
If the car was parked on say a red brick street, I'd need to take much  more care in making my selection.
So, the next time you want to quickly edit a color area in  your image, consider using the Selective Color panel found under Adjustments.