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224
Gamma
Gamma (also written "γ") is a funda-
mental property of video systems which
determines the intensity of the output
signal relative to the input. When calcu-
lating gamma, the maximum possible
input intensity is assigned a value of
one, and the minimum possible inten-
sity (no input) is assigned a value of
zero. Output is calculated by raising
input to a power that is the inverse of
the gamma value (output = input (1/ γ)).
In practical terms, raising the gamma
value has the same effect as moving the
midpoint slider to the left, raising mid-
tone output values and brightening the
image while leaving the maximum and
minimum values untouched. Lowering
the gamma value has the same effect as
moving the midpoint slider to the right,
lowering mid-tone output values and
darkening the image. The default value
for gamma is one, which produces a
linear curve in which input and output
values are the same. Gamma can be set
to any value between 0.05 and 6.00.
Opening NEF Files Saved in
Nikon Capture 3.5x or Earlier
In Capture NX, changes to color
balance apply before changes to curves.
In Nikon Capture 3.5 and earlier,
changes to curves were applied before
changes to color balance, with the
result that settings may change when
the images saved in Nikon Capture 3.5x
or earlier are opened in Capture NX.
D-Lighting
Digital DEE
D-Lighting replaces the Digital DEE tool
available in earlier versions of Nikon
Capture. Note that Digital DEE settings
are ignored when joint settings files
created with earlier versions of Nikon
Capture 4 are loaded into Capture NX,
while Digital DEE settings saved with
NEF images in earlier versions of Nikon
Capture 4 are lost when these images
are opened in Capture NX. Digital DEE
settings files (extension ".ndd") cannot
be loaded into Capture NX.
Lack of Gradation
D-Lighting will not have the desired
effect on images which show complete
lack of gradation (i.e., are completely
black or completely white) in shadows
or highlights.
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