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Nikon Capture 4 Editor
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The Master Lightness Channel
Although it affects brightness rather than color, editing luminosity has a similar effect to editing 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” ; 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 horizontal 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 brightness 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 adjusted 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
Changes to the LCH Editor Palette
The LCH Editor palette now contains the following channels:
The Color Lightness Channel
The Color Lightness channel controls the brightness of colors without affecting chroma or hue. It can be used, for example, to
brighten the blue of a dark sky.
Color lightness curve: Maps the brightness of colors in the original image (input) to the brightness of colors after editing
(output). Moving a point on the curve upward makes colors in the affected portion of the color range more brighter, while
moving it downward makes the affected colors darker.
Width slider: Adjust the width of the curve that passes through the selected point, increasing or decreasing the range of colors
affected by the change.
Intensity: The amount by which the brightness of colors under the selected point will be increased or decreased in the output
image.
Width slider
Color lightness curve
(vertical axis corresponds to
brightness, horizontal axis to
chroma)
IntensityInput display