Nikon 25338 User Manual - Page 160
Correct, Color Aberration Control
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Adjust Menu Chapter 22 154 THRESHOLD The Threshold slider is designed to limit where sharpening is applied with the current settings. The higher the threshold setting, the less that objects in the image will be sharpened. This slider works to indicate how much of a difference between one pixel and its neighbors is necessary in order to apply sharpening. This slider is helpful in preventing smooth areas from picking up noise artifacts, such as when sharpening skin areas or landscapes with large amounts of sky. Too high a threshold setting will prevent any objects from being sharpened in the image, so it is important to find a good balance. Once you have set the three sliders within the Unsharp Mask feature, you can return to the Channel Menu and select an additional channel to sharpen. You may also select one of the channels that you have already applied sharpening to in the Channel Sharpening List box. After selecting one of the channels, you can modify those settings by rearranging the sliders, or you can delete the effect on that channel by clicking on the button. Once you are satisfied with the results of the Unsharp Mask feature, click on the OK button. If you want to cancel the feature, click on the Cancel button. Correct Color Aberration Control The Color Aberration Control feature can be used to adjust and control potential color fringes that can occur in photographs. Color aberration is caused by the different angles at which the different color wavelengths are refracted when traveling through a lens element. The result, called a color aberration, appears as a color halo on the side of an object that is positioned away from the center of the image. The controls provided within the Color Aberration Control feature help remove the color fringing by providing you with two sliders that shift colors into and away from the center of the image. It is recommended that you view the image at 100% while making color aberration changes. It is important to review the results of the changes, especially around the corners of the image, to balance the effect. RED - CYAN The Red - Cyan Slider contracts and expands the red channel to reduce either red or cyan fringing. Moving the slider to the left reduces red fringes, while moving the slider to the right
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