Nikon 9235 Reference Manual - Page 69

Automatic Contrast Adjustment, For more information on, require adjustment

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Automatic Contrast Adjustment In automatic contrast adjustment, Nikon Scan automatically selects white and black points that exclude a certain percentage of the brightest and darkest pixels in the image, steepening curves for enhanced contrast (the exact percentage of pixels excluded can be specified in the Preferences dialog). By default, 0.5% of the brightest and darkest pixels are excluded, producing a curve that makes optimal use of the output tone range while preserving details in shadows and highlights. To perform an auto contrast operation, click the auto contrast button ( ). The white and black points for each of the red, green, and blue channels will be modified simultaneously (the master curve is unaffected). Clicking the button with the Ctrl (Windows) or option (Macintosh) key held down adjusts contrast only for the channel currently selected in the channel menu. If both the brightness and color balance of the image seem to require adjustment, click the auto contrast button to adjust both brightness and color by creating new black and white points based on tone information for the current crop. If you are satisfied with color balance but feel that brightness and contrast require adjustment, select the master channel and click the auto contrast button while holding down the Ctrl (Windows) or option (Macintosh) key. This will adjust brightness without affecting the curves for the component colors. Pg. For more information on: 134 Preferences-setting the "excluded" value for auto contrast operations Reference:The Tool Chest 68

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68
Reference:The Tool Chest
Automatic Contrast Adjustment
In automatic contrast adjustment, Nikon Scan automatically se-
lects white and black points that exclude a certain percentage
of the brightest and darkest pixels in the image, steepening curves
for enhanced contrast (the exact percentage of pixels excluded
can be specified in the Preferences dialog).
By default, 0.5% of
the brightest and darkest pixels are excluded, producing a curve
that makes optimal use of the output tone range while preserv-
ing details in shadows and highlights.
To perform an auto contrast operation, click the auto contrast
button (
).
The white and black points for each of the red,
green, and blue channels will be modified simultaneously (the
master curve is unaffected).
Clicking the button with the Ctrl
(Windows) or option (Macintosh) key held down adjusts con-
trast only for the channel currently selected in the channel menu.
If both the brightness and color balance of the image seem to
require adjustment, click the auto contrast button to adjust both
brightness and color by creating new black and white points
based on tone information for the current crop.
If you are sat-
isfied with color balance but feel that brightness and contrast
require adjustment, select the master channel and click the auto
contrast button while holding down the Ctrl (Windows) or
option (Macintosh) key.
This will adjust brightness without af-
fecting the curves for the component colors.
Pg.
For more information on:
134
Preferences—setting the “excluded” value for auto
contrast operations