UMAX Technologies PowerColor, Руководство пользователя, Страница: 96 / 127

5-14 PowerColor User Guide
Setting the Input Range Manually
To set the Input Range Manually, first, perform an Auto Range by clicking on the
Auto Range icon within the Control bar. Next, select the Pointed cursor from the
Control bar, then click on the diamond shaped Highlight (white) and Shadow
(black) densitometers within the region, and move them to the desired locations.
Changing the Diffused Highlight and Shadow Point : An
Example
It is very important to understand the interaction between the diffused highlight
and shadow point in the image, the diffused highlight and shadow fields in the
Production Controls, and the highlight and shadow cast correction setting in the
Production Controls. One will always affect the other.
• The sticky densitometers reflect the exact points of interest.
• The Highlight and Shadow fields within the Tone Window control the values
those points will inherit.
• The Cast settings influence how the values react to one another when a new
value is typed into one of the fields or when you select a different cast set-
ting.
For this example, an IT8 target is used, although a similar target containing
a gray wedge would work as well.
The bottom of the target contains 22 steps of gray bordered by paper white and
black. Let’s refer to paper white as a specular highlight (any point that should
contain no color) and black as our shadow point.
By selecting the pointed cursor from the Control bar, you can pick up the high-
light sticky densitometer and drag it to a new location. First, place the highlight
densitometer on the specular highlight. This will cause that area to become our
point of interest and reflect the values in the Highlight field from the Tone
Window.
We will now work with the Highlight fields in the Tone Window. First, click the
Cast button and make sure the Highlight and Shadow Cast Correction is set to
full. In the Cyan field next to the Diffused Highlight label type in “0” and hit
Enter. Notice that both the Magenta and Yellow values changed automatically.
This is because the Cast Correction setting is on Full--The color computer will
always keep the CMY values adjusted based on the Cast setting. The Color
Computer knows the relationship between Cyan, Magenta and Yellow based on