Select a color then use the Erase Paper plug-in.
This feature is available in all Alias products.
The Erase Paper tool plug-in
is added to the
Paint Edit
palette.

The quickest and most accurate way to select a color is by using the eye dropper. Click the eye dropper then click the color you want on the canvas.
The color is removed.

In Design and Automotive, and AutoStudio the image layer is duplicated before the color is removed. The new layer contains the original un-erased version, which you can access through the Canvas Layer Editor.