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You can use a Hue/Saturation adjustment layer to change individual colors in a photograph.
Making a change to a single color only changes that color.
The complementary color is not changed.
In contrast, if you use a Levels adjustment layer to change a single color, the complimentary color is also changed.
That's often a disadvantage.
So, you may want to use a Hue/Saturation adjustment layer.
Here's the Hue/Saturation window.
Be sure to check off as you go along.
1) Create a Hue/Saturation adjustment layer.
Click the Create adjustment layer icon, the half-dark, half-bright, circle at the top of the Layers palette, and select Hus/Saturation.
The Hue/Saturation window (above) will open.
Make the adjustments described below, and click OK.
If you need to make further adjustments, double click the Hue/Saturation window thumbnail in the Hue/Saturation adjustment layer to reopen the Hue/Saturation window.
2) Select a color in the Edit box.
Use the Saturation slider to change the color.
To learn how to determine which color to change, go to Measure Color.