Apple MB673Z/A User Manual - Page 398

Working with the Devignette Controls You use the Devignette controls to correct a vignette that was applied to an image as it was shot. The term vignette describes an image whose brightness fades to its periphery from its center. Vignettes are usually caused by poor lens design, stacked filters, lens hoods, and wide-angle zoom lenses. Aperture corrects the image by increasing the brightness on the edges of the image where vignettes typically occur. Note: When you apply a devignette and crop adjustment to the same image, Aperture applies the devignette adjustment prior to the crop in order to correct lens artifacts. Applying the devignette adjustment before the crop prevents any distortion that would otherwise appear in the cropped image. Before Devignette adjustment After Devignette adjustment To remove the vignette from your image: 1 Select an image. 2 In the Devignette area of the Adjustments inspector or the Adjustments pane of the Inspector HUD, adjust the Amount parameter by doing one of the following: Use the Amount slider and value slider to adjust the amount of brightness applied to the edges of the image. Â Drag the Amount slider to the left to decrease amount of brightness applied to the edges of the image, or drag it to the right to increase the brightness. Â Click the left or right arrow in the Amount value slider to change the brightness applied to edges of the image, or drag in the value field. The left arrow decreases the amount of brightness applied to the edges of the image, and the right arrow increases the brightness. Â Double-click the number in the Amount value slider, then enter a value from 0.0 to 1.0 and press Return. 398 Part III Performing Image Adjustments