Nikon 25338 User Manual - Page 88

Chapter 13 82 White Control Point The White Control Point enables you to place a Control Point directly onto your image, causing the targeted color to become white, which is the first step in removing a color cast from the light tones in your image. The White Control Point is not accessible while working within the Browser. Neutral Control Point Neutral Control Points enable you to correct a color cast in your photograph by forcing the targeted color to become a defined color or to become neutral. The Neutral Control Point is not accessible while working within the Browser. Toolbar F4 - Black, Whi te, and Neutral Control P oints White points are normally set on what should be the lightest point of the image and are used to establish one end of the dynamic range of the image. The Double-Threshold function within the Photo Info's Histogram section is designed specifically to help you locate the darkest and the lightest sections of your image. Please see page 100 for more information on how to use the Double-Threshold function. A White Control Point is often used in conjunction with a Black Control Point. For additional information regarding White Control Points, please see page 165. In its default operation, the Neutral Control Point will change the color values in the targeted color so that the red, green, and blue values for that color are equal. By equalizing the red, green, and blue values for a specific color, that color becomes neutral, or lacks saturation. Desaturating can be helpful if the image contains a neutral point of reference, a gray card, for example. By selecting an object that is established as neutral, Capture NX is able to calculate the difference between that object and the color that is currently representing that object. The Neutral Control Point will remove the difference in color from the targeted object, as well as from the entire image. This results in a color change that affects the entire image.