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CaptureNX-D Reference Manual
30
Introduction Viewing Pictures Filters Image Adjustment Other Features Menu Guide
Tool Buttons
Levels & Curves
Adjust contrast, tone (brightness), and color
balance. Adjustments can be made over the
entire image or to specic portions of the tone range (for example, the gamut of
a specic printer, monitor, or other output device), allowing enhancements to be
made without sacricing detail.
q
Channel: The current color channel.
w
Auto Contrast: Increase contrast by setting
the white and black points to exclude a
set proportion of the brightest and dark-
est pixels in the image, creating a curve
that makes optimal use of the output tone
range while preserving details in shadows
and highlights.
e
Set Black Point: Click this button and then
click the image in the preview palette to
set the black point for the red, green, and
blue channels to the value for the pixel un-
der the cursor.
r
Set Neutral Point: Click this button and then
click the image in the preview palette to
set the midpoint for the red, green, and
blue channels to the value for the pixel un-
der the cursor.
t
Set White Point: Click this button and then click the image in the preview pal-
ette to set the white point for the red, green, and blue channels to the value
for the pixel under the cursor.
y
Add Anchor Point: Click this button and then click the image in the preview area
to add a point to the curve corresponding to the value of the pixel under the
cursor.
u
Reset Current Channel: Reset the curve for the current channel to linear.
wert
o
!0
!1
!2
!3
!5
!4
iyu
q
i
Reset All Channel: Reset all curves to linear.
o
White-point output-level slider: Choose the maximum output level (white point).
Dragging the slider down lowers the brightness of the brightest pixels.
!0
Histogram: The histogram shows how the pixels in the image are distributed
with respect to brightness. The horizontal axis corresponds to brightness (in
the range 0–255), the vertical axis to the number of pixels.
!1
Tone curve: The slope and shape of the curve determines the brightness of the
image in the corresponding portion of the tone range.
!2
Black-point output-level slider: Choose the minimum output level (black point).
Dragging the slider up increases the brightness of the darkest pixels.
!3
Black-point input slider: Any pixels in the portion of the tone range to the left of
the black point are output at the minimum output level. Dragging the slider
to the right steepens the curve and enhances contrast but may cause loss of
details in shadows.
!4
Gamma: Dragging the slider to the left increases the brightness of mid-tones,
while dragging it to the right makes mid-tones darker.
!5
White-point input slider: Any pixels in the portion of the tone range to the right
of the white point are output at the maximum output level. Dragging the
slider to the left steepens the curve and enhances contrast but may cause
loss of details in highlights.
Sampling the Current Channel
By default, the black point, white point, add anchor point, and auto contrast controls respectively set
the black point, anchor points, white point, and contrast for all channels. To apply these controls only
to the current channel, press Ctrl (or on Mac computers, the option key) while clicking the control.