Color Masking
From ZBrush Info
Color masking allows you to use your model's color information as a mask. This can be useful for both painting and sculpting your model.
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Color Masking Controls
ColorMask: When on, masking will be automatically applied to the model depending on the grayscale intensity of the colors of the model's polygons. This is somewhat similar to creating an alpha from the painting on the object, and then using that alpha to apply a mask to the model.
Note that this is an AUTOMATIC effect; the mask will not be shown, and it will change dynamically as the color of the model changes.
ColorMaskInt: Determines the maximum value of masking applied when ColorMask is on.
ColorMaskCurve: When ColorMask is on, this curve can be used to set exactly how much automasking is applied to various color gray intensities.
EditCurve:Close: The Close button collapses the Edit Curve into its minimized state.
EditCurve:Copy: The Copy button copies this curve in preparation for pasting it here or elsewhere.
EditCurve:Load: The Load button loads this curve from a saved disk file.
EditCurve:Noise: The Noise slider adds random turbulence to this curve. A value of 0 adds no turbulence; the curve is smooth.
EditCurve:Paste: The Paste button over-writes this curve with the most-recently copied one. Curves can be copied from here or from other interface items, and pasted here.
EditCurve:Redo: Press the Redo button to repeat an undone curve-editing action. This button is only active if Undo has been pressed.
EditCurve:Reset: The Reset button resets the shape of the curve to its original state.
EditCurve:Save: The Save button saves this curve (its shape and Noise settings) to a disk file.
EditCurve:Undo: Press the Undo button to undo the last curve-editing action.
