Legal values: handle must be a valid handle to an object

Makes certain colors opaque or transparent.

modifyColorA() changes the ColorA attribute for the existing object handle. It indicates how opaque each color channel should be. If color has a red component of zero, any red parts of the object will be clear. Yellow parts will be somewhat see-through, and blue parts will be solid. The alpha component of color is the maximum opacity for all colors; if it is 0, the entire object is clear.