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164
Black points are normally set on what
should be the darkest point of the
image and are used to establish one
end of the dynamic range of the image.
The Double-Threshold function within
the Photo Info's Histogram section is
designed specifically to help you locate
the darkest and lightest sections of
your image.
more information on how to use the
Double-Threshold function. A Black
Control Point is often used in conjunc-
tion with a White Control Point.
After you place a Black Control Point
on your image, a Black Point Dialog Box
appears next to the Edit List. The Black
Control Point can be repositioned by
clicking and dragging on it. It can be
deleted by selecting the Control Point
and pressing the Delete key on your
keyboard, and it can be modified using
the Control Point's slider.
After placing the Black Control Point,
you can control the luminosity of the
black point either by using a slider or
by entering a luminosity value into
the Black Point Dialog Box. Use the
Reset button to return the settings of
the Black Control Point to the default
settings.
When you click on the Advanced
button, the advanced controls for the
Black Control Point are displayed within
the Black Point Dialog Box.
Within the Advanced area of the Black
Point Dialog Box, you have the option of
changing the method of controlling the
Black Control Point from controlling only
Please see page 100 for
the Luminosity to controlling the values
for red, green, and blue separately. You
can also hide the Black Control Point or
reset it to the default settings.
Luminosity Mode
The Luminosity Mode of the Black
Control Point always changes the color
that you have targeted by setting the
Black Control Point to a neutral black.
This is often the most efficient mode to
use, as most calibrated printers work
best when the image is set to a neutral
black. Within this mode, you are
presented with only one slider on the
Black Control Point and only one entry
box in the Black Point dialog.
RGB Mode
The RGB Mode of the Black Control
Point enables you to set the individual
red, green, and blue values of the
target to black. This option is helpful
if your printer requires a non-neutral
black. Within this mode, you are
presented with three sliders on the
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