Bedienungsanleitung Nikon Capture NX1 (Seite 264 von 272) (Englisch)

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262 Chapter 28 — Appendix: Additional Notices | Levels & Curves

Levels & Curves

❏ The Levels & Curves and the LCH Tools

The Levels & Curves tool controls the distribution of tones in the red, green, and blue channels and in

the RGB master channel, and provides visual feedback on the amount of tone information lost through

editing. The LCH tool is a better suited to making fine adjustments to luminosity (brightness), color

saturation, and hue; note, however, that changes to these settings may produce results that exceed the

dynamic range of the RGB channels.

❏ Auto Contrast Settings

Auto contrast, shadow, and highlight settings can be adjusted in the “Levels & Sampling” tab of the

“Preferences” dialog.

❏ The Curve Edit Display

Although values for input and output in the Levels & Curves tool range from zero to 255 (eight-bit

precision, familiar to users of other image editing software), the results of any changes to curves are

calculated at a precision of sixteen bits. This allows twelve-bit RAW data to be modified without lowering

the quality of the output.

❏ The Histogram (RAW / 16-Bit TIFF Images Only)

To reduce display times when dealing with large amounts of image data, Capture NX 2 may display a

histogram containing vertical lines.

❏ Sampling White Point or Black Point for the Current Channel

By default, sampling sets the white point or black point for all channels and displays the master channel.

To set the white or black point for the current channel only, sample the image while pressing Ctrl

(Windows) or command (Macintosh). Mid-point cannot be sampled for a single channel; regardless of

the channel currently selected, sampling the image for mid-point always sets the mid point for all

channels and displays the master channel.

❏ Gamma

Gamma (also written “γ”) is a fundamental property of video systems which determines the intensity of

the output signal relative to the input. When calculating gamma, the maximum possible input intensity

is assigned a value of one, and the minimum possible intensity (no input) is assigned a value of zero.

Output is calculated by raising input to a power that is the inverse of the gamma value (output = input

(1/ γ)). In practical terms, raising the gamma value has the same effect as moving the midpoint slider to

the left, raising mid-tone output values and brightening the image while leaving the maximum and

minimum values untouched. Lowering the gamma value has the same effect as moving the midpoint

slider to the right, lowering mid-tone output values and darkening the image. The default value for

gamma is one, which produces a linear curve in which input and output values are the same. Gamma

can be set to any value between 0.05 and 6.00.

❏ Opening NEF Files Saved in Nikon Capture 3.5x or Earlier

In Capture NX 2, changes to color balance apply before changes to curves. In Nikon Capture 3.5 and

earlier, changes to curves were applied before changes to color balance, with the result that settings may

change when the images saved in Nikon Capture 3.5x or earlier are opened in Capture NX 2.

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