What feature allows users to adjust color balance in an image?

The feature that allows users to adjust color balance in an image is Levels. This tool enables you to manipulate the highlights, midtones, and shadows of an image based on its tonal values. By adjusting the input levels, you can control how much of each color channel is represented in the image, which in turn affects the overall color balance. This adjustment is essential for correcting color casts or enhancing colors to achieve a desired visual effect.

While Curves also provides a more advanced way to adjust tonal ranges and can influence color balance, it primarily focuses on the mapping of tones rather than direct color balance adjustments. Saturation specifically refers to the intensity of colors, which impacts vibrancy but not the balance of colors between channels. Contrast deals with the difference between light and dark areas in an image and does not directly address color balance either. Thus, Levels is the feature most closely aligned with adjusting color balance effectively.