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The LCH Editor
The LCH Editor models color using three components, Lumi-
nosity (brightness), Chroma (color saturation, or vividness), and
Hue, each with its own edit display. The luminosity and chroma
displays take the same form as the curve edit display in the
Curves palette. By steepening the curve in the luminosity dis-
play, you increase the difference between the bright and dark
portions of the image, increasing contrast. Steepening the curve
in the chroma window increases color saturation, making col-
ors more vivid. Both editors feature a histogram display, auto
contrast, and white point, black point, and gray point sliders,
allowing you to match the maximum, minimum, and mid-range
output levels for luminosity and chroma to the values actually
present in the input, making the maximum use of the scanner's
dynamic range. They also incorporate output level sliders, mak-
ing it possible to edit the maximum and minimum values for
output.
Changes made in the LCH Editor only apply when the check-
box at the top left of the palette is checked. When this box is
checked, changes will be visible in the image being edited. The
box can be checked and unchecked for a quick "before-and-
after" comparison, allowing you to see whether changes are
having the desired effect.
Reference: The Tool Chest
The hue editor features unique controls that grant unparalleled
flexibility when editing colors. Using this tool, you can map a
specific range of colors in the input to a different range of col-
ors in the output, allowing you to make the reds in the image
more orange, for example, or even green or blue.
The LCH Editor can only be used when the Nikon Color Man-
agement system (CMS) is on. If Nikon CMS is off, the tools in
the editor will be disabled. To use the LCH Editor with a color
space that has the same gamut as uncalibrated RGB data ob-
tained directly from the scanner, turn CMS on and select Scan-
ner RGB as the color-space profile for the RGB color model.
Pg. For more information on:
107 Nikon CMS
78
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