%O: replaced by colour(%N) The X11 versions allows colours to be
replaced by pixmap
objects, The MS-Windows version does not allow this. If a
pixmap object is
specified as a colour, the system will check whether the pixmap is
derived from one of the standard grey-patterns (@grey25_image,
etc.) and replace the pixmap by a grey colour. If this fails it will use colour(black).
This error is raised if a pixmap is replaced.
You may redefine the mapping by attaching an object->attribute
named replacement_colour to the pixmap.
