Make A Color Change Using
A Hue And Saturation
Adjustment Layer

Hue and Saturation Method 1

The easiest and fastest way of making a color change is to use a Hue and Saturation Adjustment Layer.

1. The first thing you need to do is to decided which color change you want to make. In my example I want to change the color of the VW. It is kind of yellow now.

2. Select Layers > New Adjustment Layer > Hue and Saturation. Click OK which will bring up the Hue and Saturation dialogue.

   
   

3. At the top of the dialogue you see the Edit: selector. Drop down this menu - you will see a number of colors there. I am replacing Yellow so I selected Yellow. This means that everything that is Yellow will change according to how I move the three lower sliders.

4. Make sure that Preview is checked.

5. The three sliders (Hue, Saturation and Lightness) are all at 0. Place your cursor on the Hue slider and move it slowly all the way to the left and then all the way to the right. As you move the slider the hue of the color you selected will change. When you find a color you like - stop.

6. Now place your cursor over the Saturation slider and move it left and right until you are satisfied and then, well, stop.

7. Do the same thing with Lightness. When you are satisfied with your new color click OK.
   
   
8. You will see that the object you want to change to a different color is, in fact, the color you wanted. You will also notice that other object in the picture that are kinda the same original color have changed as well - not good but thanks to the good folks at Adobe there is a solution.

   The Hue and Saturation Layer you created has a Layer Mask attached and that means you can do some nice editing here.

   Press the D key to select the default Black and White Foreground/Background colors then press X until Black is the top color. Take your pen (or mouse if you must) and carefully paint around the part of the picture where you want to retain the original color and those colors will come back. Be careful not to color with Black on the object that you wanted to change color.

9. when everything is perfect you can flatten the image Layers > Flatten Image and you are done!