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Nikon Scan 3 Manual

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Step 4—Setting the Gray Point
The point midway between the maximum and minimum input
values is known as the “gray point” (or “midpoint”). This point
represents a neutral shade corresponding to an output level of
128. The gray point is controlled by a gray-point slider at the
bottom of the curve edit display. Moving the gray-point slider to
the left increases the brightness of mid-tones without “washing
out” details in highlights. Moving the slider to the right darkens
mid-tones without obliterating detail in shadows.
The Gray-Point Slider
The gray-point slider is located at the bottom of the curve edit
display.
After clicking the slider once to activate it, move it to the left to
increase the brightness of mid-tones in the selected channel, or
move it to the right to decrease brightness. Alternatively, you
can enter a value for gamma directly in the text box under the
slider. The effects of changes to the gray point can be seen in the
active image.
Gamma
Gamma (also written “ γ ”) is a fundamental property of video systems, one that determines the intensity of the output signal
relative to the input. When calculating gamma, the maximum possible input intensity is assigned a value of one, and the minimum
possible intensity (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 gray-point 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 gray-point 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. Gamma can be set to any value between
0.45 and 3.00.
Gray-point
slider
Gamma
value
Reference: The Tool Chest
… 73 …


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