• Use the Channel Mixer command to increase or decrease the red, blue, or green colour channel by a percentage of itself and the other two channels.
  
• Use the Hue/Saturation/Lightness command to shift all colours in an image and change their strength and lightness
  
• Use the Colour Balance command to change the balance of colours in an image. This command provides general colour correction and allows you to adjust the colour balance in shadows, midtones, and highlights
  
• Use the Red/Green/Blue command to adjust the amount of red, green, and blue in your image to make colour corrections by changing the overall colour cast
  
• If an image has a colour cast, an effective way to correct it is to select those points that you know are supposed to be black or white and shift all colours based on resetting these points to true black and true white.
  
• Use the Histogram Adjustment command to adjust the contrast and colour balance of your image.
  
• Changing Individual Colours
  
• Use the Hue Map command to replace one or more colours throughout a photograph or other complex image. For example, you can shift all greens to blues.
  You can also use the Hue Map command to change the saturation or the lightness of the image. When you adjust these values, all colours (original and shifted colours) are adjusted.
  

quote:

ORIGINAL: jaybee

Use the Hue Map command to replace one or more colours throughout a photograph or other complex image. For example, you can shift all greens to blues.
You can also use the Hue Map command to change the saturation or the lightness of the image. When you adjust these values, all colours (original and shifted colours) are adjusted.

The last one is the only thing listed under individual colour adjustment.