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Reference: The Tool Chest
White-Point and Black-Point Sliders
The white-point and black-point sliders can be used to match
the white and black points to the histogram displayed in the
curve edit display.
To edit the white point or black point, click the corresponding
slider once to activate it, then drag it to the right or left (a value
can also be entered directly in the text box underneath the
slider). Matching the black-point slider with the lowest input
value displayed in the histogram will set the minimum output
value for the selected channel to the darkest pixel actually present
in the image, steepening the curve and enhancing contrast with-
out sacrificing detail in shadows. Similarly, matching the white-
point slider with the highest input value displayed in the histo-
gram will set the maximum output value for the selected chan-
nel to the brightest pixel present in the image, enhancing con-
trast without loss of detail in highlights. Any changes are applied
instantly to the active image.
White-point
slider
Black-point
slider
Black-point
input value
White-point
input value
Содержание 9235 - Coolscan III
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Страница 143: ...142 The Preferences Dialog Appendix A Nikon ScanVisual Index ...
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