Nikon Capture NX2 user manual Correct Distortion Control, Intensity, Threshold, Correction

Intensity

The Intensity slider controls the amount of sharpening that will be applied to the color selected by the Color pull-down menu. The higher the sharpening intensity, the more pronounced the sharpening effect will be on your image. If the intensity setting is set too high, it can create an over-sharpened and artificial looking image.

Radius

The Radius slider enables you to increase the reach of the sharpening effect. The higher the radius setting, the wider the edges will appear in the sharpen image. A radius setting that is too high will produce visible halo artifacts, which can appear as white outlines around objects.

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.

Delete

Use the delete button to delete the sharpening effect that is applied to a color. First select the color to highlight it in the displayed list and then click on the delete button.

Correct > Distortion Control

The Distortion Control tool provides controls to reduce both pincushion and barrel lens distortions. Pincushion distortion normally affects images shot with telephoto lenses and results in image details appearing as though they are being pulled into the center of the image. Barrel distortion, the opposite of pincushion distortion, normally affects images shot with wide-angle lenses and results in an image that appears to have details that bow outward away from the center of the image. Pincushion and barrel distortion are more apparent at the edges of the images.

The Distortion Control tool provides you with the following controls:

Correction

Use the Correction slider to reduce lens distortions from the image. Move this slider to the left to reduce pincushion distortion or move the slider to the right to reduce barrel distortion.

202Chapter 20 — Adjust Menu Correct > Distortion Control