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To adjust a photo’s color balance, use the Temperature slider, the Tint slider, or both.
Temperature. The Temperature slider adjusts a photo’s color temperature. To make a photo appear cooler (more bluish tones), drag the slider to the left. To make a photo appear warmer (more yellow/orange tones), drag the slider to the right.
Original
Cooler
Warmer
Tint. The Tint slider adjusts red/green color balance. If you drag the slider to the left, iPhoto adds red, making a photo appear less green. If you drag the slider to the right, you add green and lessen the amount of red. The Tint slider can help remove the greenish color cast that you may find in photos taken under fluorescent lighting.