Selected Color
The Selected Color icon displays and determines the color of all drawn strokes and objects. You can click this picker to use the current Color palette settings, or click and drag to the canvas or ZBrush interface to select the color at that point.
Once Col
The Once Color button causes brushstrokes and objects to pick a color from the canvas when first clicked, and hold that color throughout the following brushstroke.
Cont Col
The Continuous Color button causes brushstrokes and objects to change their color to the colors already on the canvas, continuously while dragging.
Reference Guide > Picker> Color