Apple MB673Z/A User Manual - Page 422

To adjust vibrancy in an image: 1 Select an image. 2 In the Enhance area of the Adjustments inspector or the Adjustments pane of the Inspector HUD, adjust the Vibrancy parameter by doing one of the following: Use the Vibrancy slider and value slider to add smart saturation to the image. Â Drag the Vibrancy slider. Â Click the left or right arrow in the Vibrancy value slider to change the saturation of the image by 5 percent increments, or drag in the value field. Â Double-click the number in the Vibrancy value slider, then enter a value from -1.00 to 1.00 and press Return. A value below 0.0 decreases the color saturation in the image, and a value above 0.0 increases the saturation of the nonsaturated colors. A value of -1.00 removes all color from the image, making it grayscale except for any skin tones. Setting the Tint of the Black, Gray, and White Values in the Image You use the Black Tint, Gray Tint, and White Tint color wheels when you want to selectively remove color casts from the shadows, midtones, and highlights in the image. Color casts are often caused by shooting in mixed lighting and unnatural lighting situations, where the difference in the color from the mixture of multiple types of source lights can produce a color variance in a specific tonal range in an image. For example, when shooting indoors, interior incandescent (tungsten) lighting can often produce a yellow color cast through the white colors in the image. Using the White Tint eyedropper, you can have Aperture isolate the highlights and add blue to the white values, thereby reducing the yellow color cast and returning the whites to neutral white. 422 Part III Performing Image Adjustments