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Color Cast Control
The color cast control lets you select a color based on the HSV color space with V fixed at 100%. You can set a color either by using the controls described below or by clicking on the input image in the main image area.
Color Wheel
Clicking on the color wheel sets the current color.
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Zoom Tool Bar
The zoom buttons let you zoom in or out on the color wheel. When you zoom in, the color wheel is enlarged centered on the current control point, if any, and scroll bars are displayed next to the color wheel to let you move around as illustrated below. Zooming in makes it easier to make fine adjustments to the control points; zooming out lets you see more of the color wheel at once. You can zoom in a maximum of four levels.
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Settings Menu
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These settings determine the size of the probe used to select colors for new control points. Larger probes are less sensitive to noise while smaller probes can select finer detail.