The gradation curve (black) defines how tone compression is handled. The horizontal axis shows
input density while the vertical axis displays the output density. The points (called “anchor points”)
are located, from left to right, at the following values: highlights, quarter tones, midtones, three-
quarter tones, and shadows. By selecting an anchor point and dragging it up or down, you can alter
the gradation value for that point.
The black lock icon at the bottom left-hand corner of the grid is open by default. By clicking on it,
you can lock the anchor points on the curve. This allows you to move the points individually without
affecting the others. Locking the anchor points is useful for fine-tuning the gradation curve.
Remember that adjustments in the gradation curve change the input-to-output tonal compres-
sion. For example, moving the three-quarter tone point down expands the shadow area of the
image by starting the three-quarter tone range at a lower optical density.
Color
The Color option in the RGB Control window provides control over high chroma (saturated) and low
chroma (pastel) in all primary and secondary colors independently.
Use the Color Selection color wheel to select the individual color to be corrected. You can also click
on any area of the image and the software automatically detects the selected pixel’s high value and
whether it is a pastel or saturated color. To toggle between the high and low chroma colors, click on
the color wheel. This toggle feature allows you to make changes in the darker or lighter colors
without affecting the other.
10
RGB Expert Controls
UMAX PowerColor Quick Start Guide
Summary of Contents for PowerColor
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