• Block: Using the pointer, select two data points to create a block. All colors comprised in the block are removed from the color mask.

• Oriented Block: Using the pointer, select two data points to create an oriented block. All colors comprised in the block are removed from the color mask.

• Element: Using the pointer, select an existing closed vector element. All colors comprised in the element are removed from the color mask.

• Shape: Using the pointer, draw a shape to delimit the input region. All colors comprised in the shape are removed from the color mask.

Used to select in which mask the colors are subtracted. The drop-down list shows the existing masks that can be edited.

Used to turn the Work in Image Plane feature ON or OFF.

If ON, all operations are done as if the coordinate system is aligned with the specified raster attachment. If OFF, all operations are done in the active view and in this view's coordinate system. If ON, the Fence area is not available.

Use to turn the highlight feature ON or OFF. The highlight feature changes all pixels that match the color(s) of the selected color mask to the highlight color.