Nikon 4 Bedienungsanleitung PDF herunterladen (Seite 62)

Image Adjustment

The Master Lightness Channel

Although it affects brightness rather than color, editing luminosity has a similar effect to edit-

ing the master curve in the Curves palette.

Luminosity curve: Maps luminosity in the original image (input) to the luminosity of the image

after editing (output). Any portion of the curve can be edited as described in “Curves” (

48); steepening the curve increases the difference between light and dark areas of the image,

increasing contrast.

Histogram: Shows the distribution of pixels of different luminosities in the input. The hori-

zontal axis corresponds to luminosity (in the range 0–255), the vertical axis to the number of

pixels.

Output level sliders: Choose the maximum (white point) and minimum (black point) values

for output.

Input level sliders: Choose the maximum (white point) and minimum (black point) input

levels.

Mid-point slider: Set the mid-point (gamma value). Moving the mid-point alters the bright-

ness of mid-tones while preserving detail in highlights and shadows.

Show Histogram button: Click to view the luminosity distribution for the ﬁ nal image. Click

again to view the input luminosity distribution.

Auto Contrast button: Set the maximum and minimum input levels to exclude values for 0.5%

of the brightest and darkest pixels in the crop. The percentage of pixels excluded can be ad-

justed in the Advanced Color tab in the Preferences dialog.

Show Histogram button

Auto Contrast button

Histogram

White-point

input slider

Mid-point

slider

Black-point

input slider

Black-point output

level slider

White-point output

level slider

Luminosity curve

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Nikon 4 Bedienungsanleitung Seite 62